hide results

    Advances List by Anonymous

    Updated: 01/01/70 | Printable Version | Search This Guide

                   C I V I L I Z A T I O N    A D V A N C E S
                                Cross Reference
    
    
         <- = prerequisites, listed in reverse chronological order
         -> = successors, listed in forward chronological order
    
    
         ADVANCES
         --------
    
         Alphabet          -> Writing, MapMaking, Code of Laws, Mathematics, 
                              Diplomat, Library, Trireme, Lighthouse, Courthouse, 
                              Literacy, Monarchy, Trade, Catapult, Astronomy, 
                              Great Library, Republic, Philosophy, Feudalism, 
                              Caravan, Copernicus, Navigation, Banking, Medicine, 
                              Religion, Democracy, University, Chivalry, 
                              Invention, Sail, Magellan, Physics, Bank, 
                              Shakespeare, Cathedral, J.S. Bach, Michelangelo, 
                              Chemistry, University (Imp), Theory of Gravity, 
                              Knight, Gunpowder, Magnetism, Steam Engine, 
                              Isaac Newton, Atomic Theory, Explosives, Musketeer, 
                              Metallurgy, Frigate, Railroad, Ironclad, 
                              Conscription, Cannon, Electricity, Darwin's Voyage, 
                              Industrialization, Rifleman, Electronics, Transport, 
                              Factory, Women's Suffrage, Steel, Corporation, 
                              Communism, Hydro Plant, Hoover Dam, Computers, 
                              Battleship, Refining, Genetic Eng., United Nations, 
                              SETI Program, Power Plant, Combustion, 
                              Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
                              Mass Production, Fighter, Advanced Flight, 
                              Labor Union, Submarine, Mass Transit, Recycling, 
                              Nuclear Fission, Bomber, Carrier, Rocketry, 
                              Mech Infantry, Recycling Center, Manhattan Project, 
                              Nuclear Power, Nuclear Unit, Space Flight, 
                              Nuclear Plant, SS Structure, Apollo Program, 
                              Plastic, SS Component, Superconductor, Robotics, 
                              Fusion Power, SDI Defence, Artillery, Mfg Plant, 
                              SS Module
    
         Bronze Working    -> Iron Working, Currency, Legion, Marketplace, Trade, 
                              Construction, Caravan, Aqueduct, Colosseum, 
                              Fortress, Engineering, Bridge Building, Banking, 
                              Medicine, Invention, Bank, Shakespeare, Chemistry, 
                              Gunpowder, Steam Engine, Explosives, Musketeer, 
                              Metallurgy, Railroad, Ironclad, Conscription, 
                              Cannon, Electricity, Darwin's Voyage, 
                              Industrialization, Rifleman, Electronics, Transport, 
                              Factory, Women's Suffrage, Steel, Corporation, 
                              Communism, Hydro Plant, Hoover Dam, Computers, 
                              Battleship, Refining, Genetic Eng., United Nations, 
                              SETI Program, Power Plant, Combustion, 
                              Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
                              Mass Production, Fighter, Advanced Flight, 
                              Labor Union, Submarine, Mass Transit, Recycling, 
                              Nuclear Fission, Bomber, Carrier, Rocketry, 
                              Mech Infantry, Recycling Center, Manhattan Project, 
                              Nuclear Power, Nuclear Unit, Space Flight, 
                              Nuclear Plant, SS Structure, Apollo Program, 
                              Plastic, SS Component, Superconductor, Robotics, 
                              Fusion Power, SDI Defence, Artillery, Mfg Plant, 
                              SS Module
    
         Ceremonial Burial -> Temple, Mysticism, Monarchy, Oracle, Astronomy, 
                              Philosophy, Feudalism, Copernicus, Navigation, 
                              Medicine, Religion, Democracy, University, Chivalry, 
                              Sail, Magellan, Physics, Shakespeare, Cathedral, 
                              J.S. Bach, Michelangelo, Chemistry, 
                              University (Imp), Theory of Gravity, Knight, 
                              Magnetism, Steam Engine, Isaac Newton, 
                              Atomic Theory, Explosives, Metallurgy, Frigate, 
                              Railroad, Ironclad, Conscription, Cannon, 
                              Electricity, Darwin's Voyage, Industrialization, 
                              Rifleman, Electronics, Transport, Factory, 
                              Women's Suffrage, Steel, Corporation, Communism, 
                              Hydro Plant, Hoover Dam, Computers, Battleship, 
                              Refining, Genetic Eng., United Nations, 
                              SETI Program, Power Plant, Combustion, 
                              Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
                              Mass Production, Fighter, Advanced Flight, 
                              Labor Union, Submarine, Mass Transit, Recycling, 
                              Nuclear Fission, Bomber, Carrier, Rocketry, 
                              Mech Infantry, Recycling Center, Manhattan Project, 
                              Nuclear Power, Nuclear Unit, Space Flight, 
                              Nuclear Plant, SS Structure, Apollo Program, 
                              Plastic, SS Component, Superconductor, Robotics, 
                              Fusion Power, SDI Defence, Artillery, Mfg Plant, 
                              SS Module
    
         Masonry           -> Palace, City Wall, Pyramids, Great Wall, 
                              Mathematics, Construction, Catapult, Astronomy, 
                              Feudalism, Aqueduct, Colosseum, Fortress, 
                              Engineering, Bridge Building, Copernicus, 
                              Navigation, University, Chivalry, Invention, Sail, 
                              Magellan, Physics, Chemistry, University (Imp), 
                              Theory of Gravity, Knight, Gunpowder, Magnetism, 
                              Steam Engine, Isaac Newton, Atomic Theory, 
                              Explosives, Musketeer, Metallurgy, Frigate, 
                              Railroad, Ironclad, Conscription, Cannon, 
                              Electricity, Darwin's Voyage, Industrialization, 
                              Rifleman, Electronics, Transport, Factory, 
                              Women's Suffrage, Steel, Corporation, Communism, 
                              Hydro Plant, Hoover Dam, Computers, Battleship, 
                              Refining, Genetic Eng., United Nations, 
                              SETI Program, Power Plant, Combustion, 
                              Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
                              Mass Production, Fighter, Advanced Flight, 
                              Labor Union, Submarine, Mass Transit, Recycling, 
                              Nuclear Fission, Bomber, Carrier, Rocketry, 
                              Mech Infantry, Recycling Center, Manhattan Project, 
                              Nuclear Power, Nuclear Unit, Space Flight, 
                              Nuclear Plant, SS Structure, Apollo Program, 
                              Plastic, SS Component, Superconductor, Robotics, 
                              Fusion Power, SDI Defence, Artillery, Mfg Plant, 
                              SS Module
    
         The Wheel         -> Chariot, Engineering, Invention, Gunpowder, 
                              Steam Engine, Explosives, Musketeer, Metallurgy, 
                              Railroad, Ironclad, Conscription, Cannon, 
                              Electricity, Darwin's Voyage, Industrialization, 
                              Rifleman, Electronics, Transport, Factory, 
                              Women's Suffrage, Steel, Corporation, Communism, 
                              Hydro Plant, Hoover Dam, Computers, Battleship, 
                              Refining, Genetic Eng., United Nations, 
                              SETI Program, Power Plant, Combustion, 
                              Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
                              Mass Production, Fighter, Advanced Flight, 
                              Labor Union, Submarine, Mass Transit, Recycling, 
                              Nuclear Fission, Bomber, Carrier, Rocketry, 
                              Mech Infantry, Recycling Center, Manhattan Project, 
                              Nuclear Power, Nuclear Unit, Space Flight, 
                              Nuclear Plant, SS Structure, Apollo Program, 
                              Plastic, SS Component, Superconductor, Robotics, 
                              Fusion Power, SDI Defence, Artillery, Mfg Plant, 
                              SS Module
    
         Horseback Riding  -> Cavalry, Chivalry, Knight
    
         Pottery           -> Granary, Hanging Garden
    
         Map Making        -> Navigation, Sail, Magellan, Physics, Magnetism, 
                              Steam Engine, Atomic Theory, Frigate, Railroad, 
                              Ironclad, Electricity, Darwin's Voyage, 
                              Industrialization, Electronics, Transport, Factory, 
                              Women's Suffrage, Steel, Corporation, Communism, 
                              Hydro Plant, Hoover Dam, Computers, Battleship, 
                              Refining, Genetic Eng., United Nations, 
                              SETI Program, Power Plant, Combustion, 
                              Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
                              Mass Production, Fighter, Advanced Flight, 
                              Labor Union, Submarine, Mass Transit, Recycling, 
                              Nuclear Fission, Bomber, Carrier, Rocketry, 
                              Mech Infantry, Recycling Center, Manhattan Project, 
                              Nuclear Power, Nuclear Unit, Space Flight, 
                              Nuclear Plant, SS Structure, Apollo Program, 
                              Plastic, SS Component, Superconductor, Robotics, 
                              Fusion Power, SDI Defence, Artillery, Mfg Plant, 
                              SS Module
    
         Writing           <- Alphabet
    
                           -> Diplomat, Library, Literacy, Great Library, 
                              Republic, Philosophy, Banking, Medicine, Religion, 
                              Democracy, University, Invention, Bank, Shakespeare, 
                              Cathedral, J.S. Bach, Michelangelo, Chemistry, 
                              University (Imp), Theory of Gravity, Gunpowder, 
                              Steam Engine, Isaac Newton, Atomic Theory, 
                              Explosives, Musketeer, Metallurgy, Railroad, 
                              Ironclad, Conscription, Cannon, Electricity, 
                              Darwin's Voyage, Industrialization, Rifleman, 
                              Electronics, Transport, Factory, Women's Suffrage, 
                              Steel, Corporation, Communism, Hydro Plant, 
                              Hoover Dam, Computers, Battleship, Refining, 
                              Genetic Eng., United Nations, SETI Program, 
                              Power Plant, Combustion, Cure for Cancer, 
                              Automobile, Cruiser, Flight, Armor, Mass Production, 
                              Fighter, Advanced Flight, Labor Union, Submarine, 
                              Mass Transit, Recycling, Nuclear Fission, Bomber, 
                              Carrier, Rocketry, Mech Infantry, Recycling Center, 
                              Manhattan Project, Nuclear Power, Nuclear Unit, 
                              Space Flight, Nuclear Plant, SS Structure, 
                              Apollo Program, Plastic, SS Component, 
                              Superconductor, Robotics, Fusion Power, SDI Defence, 
                              Artillery, Mfg Plant, SS Module
    
         MapMaking         <- Alphabet
    
                           -> Trireme, Lighthouse
    
         Code of Laws      <- Alphabet
    
                           -> Courthouse, Literacy, Monarchy, Trade, 
                              Great Library, Republic, Philosophy, Feudalism, 
                              Caravan, Banking, Medicine, Religion, Democracy, 
                              University, Chivalry, Invention, Bank, Shakespeare, 
                              Cathedral, J.S. Bach, Michelangelo, Chemistry, 
                              University (Imp), Theory of Gravity, Knight, 
                              Gunpowder, Steam Engine, Isaac Newton, 
                              Atomic Theory, Explosives, Musketeer, Metallurgy, 
                              Railroad, Ironclad, Conscription, Cannon, 
                              Electricity, Darwin's Voyage, Industrialization, 
                              Rifleman, Electronics, Transport, Factory, 
                              Women's Suffrage, Steel, Corporation, Communism, 
                              Hydro Plant, Hoover Dam, Computers, Battleship, 
                              Refining, Genetic Eng., United Nations, 
                              SETI Program, Power Plant, Combustion, 
                              Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
                              Mass Production, Fighter, Advanced Flight, 
                              Labor Union, Submarine, Mass Transit, Recycling, 
                              Nuclear Fission, Bomber, Carrier, Rocketry, 
                              Mech Infantry, Recycling Center, Manhattan Project, 
                              Nuclear Power, Nuclear Unit, Space Flight, 
                              Nuclear Plant, SS Structure, Apollo Program, 
                              Plastic, SS Component, Superconductor, Robotics, 
                              Fusion Power, SDI Defence, Artillery, Mfg Plant, 
                              SS Module
    
         Iron Working      <- Bronze Working
    
                           -> Legion, Bridge Building, Gunpowder, Explosives, 
                              Musketeer, Metallurgy, Railroad, Conscription, 
                              Cannon, Electricity, Darwin's Voyage, 
                              Industrialization, Rifleman, Electronics, Transport, 
                              Factory, Women's Suffrage, Steel, Corporation, 
                              Communism, Hydro Plant, Hoover Dam, Computers, 
                              Battleship, Refining, Genetic Eng., United Nations, 
                              SETI Program, Power Plant, Combustion, 
                              Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
                              Mass Production, Fighter, Advanced Flight, 
                              Labor Union, Submarine, Mass Transit, Recycling, 
                              Nuclear Fission, Bomber, Carrier, Rocketry, 
                              Mech Infantry, Recycling Center, Manhattan Project, 
                              Nuclear Power, Nuclear Unit, Space Flight, 
                              Nuclear Plant, SS Structure, Apollo Program, 
                              Plastic, SS Component, Superconductor, Robotics, 
                              Fusion Power, SDI Defence, Artillery, Mfg Plant, 
                              SS Module
    
         Currency          <- Bronze Working
    
                           -> Marketplace, Trade, Construction, Caravan, Aqueduct, 
                              Colosseum, Fortress, Engineering, Bridge Building, 
                              Banking, Medicine, Invention, Bank, Shakespeare, 
                              Chemistry, Gunpowder, Steam Engine, Explosives, 
                              Musketeer, Metallurgy, Railroad, Ironclad, 
                              Conscription, Cannon, Electricity, Darwin's Voyage, 
                              Industrialization, Rifleman, Electronics, Transport, 
                              Factory, Women's Suffrage, Steel, Corporation, 
                              Communism, Hydro Plant, Hoover Dam, Computers, 
                              Battleship, Refining, Genetic Eng., United Nations, 
                              SETI Program, Power Plant, Combustion, 
                              Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
                              Mass Production, Fighter, Advanced Flight, 
                              Labor Union, Submarine, Mass Transit, Recycling, 
                              Nuclear Fission, Bomber, Carrier, Rocketry, 
                              Mech Infantry, Recycling Center, Manhattan Project, 
                              Nuclear Power, Nuclear Unit, Space Flight, 
                              Nuclear Plant, SS Structure, Apollo Program, 
                              Plastic, SS Component, Superconductor, Robotics, 
                              Fusion Power, SDI Defence, Artillery, Mfg Plant, 
                              SS Module
    
         Mysticism         <- Ceremonial Burial
    
                           -> Oracle, Astronomy, Philosophy, Copernicus, 
                              Navigation, Medicine, Religion, Democracy, 
                              University, Sail, Magellan, Physics, Shakespeare, 
                              Cathedral, J.S. Bach, Michelangelo, Chemistry, 
                              University (Imp), Theory of Gravity, Magnetism, 
                              Steam Engine, Isaac Newton, Atomic Theory, 
                              Explosives, Metallurgy, Frigate, Railroad, Ironclad, 
                              Conscription, Cannon, Electricity, Darwin's Voyage, 
                              Industrialization, Rifleman, Electronics, Transport, 
                              Factory, Women's Suffrage, Steel, Corporation, 
                              Communism, Hydro Plant, Hoover Dam, Computers, 
                              Battleship, Refining, Genetic Eng., United Nations, 
                              SETI Program, Power Plant, Combustion, 
                              Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
                              Mass Production, Fighter, Advanced Flight, 
                              Labor Union, Submarine, Mass Transit, Recycling, 
                              Nuclear Fission, Bomber, Carrier, Rocketry, 
                              Mech Infantry, Recycling Center, Manhattan Project, 
                              Nuclear Power, Nuclear Unit, Space Flight, 
                              Nuclear Plant, SS Structure, Apollo Program, 
                              Plastic, SS Component, Superconductor, Robotics, 
                              Fusion Power, SDI Defence, Artillery, Mfg Plant, 
                              SS Module
    
         Mathematics       <- Masonry, Alphabet
    
                           -> Catapult, Astronomy, Copernicus, Navigation, 
                              University, Sail, Magellan, Physics, Chemistry, 
                              University (Imp), Theory of Gravity, Magnetism, 
                              Steam Engine, Isaac Newton, Atomic Theory, 
                              Explosives, Metallurgy, Frigate, Railroad, Ironclad, 
                              Conscription, Cannon, Electricity, Darwin's Voyage, 
                              Industrialization, Rifleman, Electronics, Transport, 
                              Factory, Women's Suffrage, Steel, Corporation, 
                              Communism, Hydro Plant, Hoover Dam, Computers, 
                              Battleship, Refining, Genetic Eng., United Nations, 
                              SETI Program, Power Plant, Combustion, 
                              Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
                              Mass Production, Fighter, Advanced Flight, 
                              Labor Union, Submarine, Mass Transit, Recycling, 
                              Nuclear Fission, Bomber, Carrier, Rocketry, 
                              Mech Infantry, Recycling Center, Manhattan Project, 
                              Nuclear Power, Nuclear Unit, Space Flight, 
                              Nuclear Plant, SS Structure, Apollo Program, 
                              Plastic, SS Component, Superconductor, Robotics, 
                              Fusion Power, SDI Defence, Artillery, Mfg Plant, 
                              SS Module
    
         Literacy          <- Code of Laws, Writing, Alphabet
    
                           -> Great Library, Republic, Philosophy, Banking, 
                              Medicine, Religion, Democracy, University, 
                              Invention, Bank, Shakespeare, Cathedral, J.S. Bach, 
                              Michelangelo, Chemistry, University (Imp), 
                              Theory of Gravity, Gunpowder, Steam Engine, 
                              Isaac Newton, Atomic Theory, Explosives, Musketeer, 
                              Metallurgy, Railroad, Ironclad, Conscription, 
                              Cannon, Electricity, Darwin's Voyage, 
                              Industrialization, Rifleman, Electronics, Transport, 
                              Factory, Women's Suffrage, Steel, Corporation, 
                              Communism, Hydro Plant, Hoover Dam, Computers, 
                              Battleship, Refining, Genetic Eng., United Nations, 
                              SETI Program, Power Plant, Combustion, 
                              Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
                              Mass Production, Fighter, Advanced Flight, 
                              Labor Union, Submarine, Mass Transit, Recycling, 
                              Nuclear Fission, Bomber, Carrier, Rocketry, 
                              Mech Infantry, Recycling Center, Manhattan Project, 
                              Nuclear Power, Nuclear Unit, Space Flight, 
                              Nuclear Plant, SS Structure, Apollo Program, 
                              Plastic, SS Component, Superconductor, Robotics, 
                              Fusion Power, SDI Defence, Artillery, Mfg Plant, 
                              SS Module
    
         Monarchy          <- Code of Laws, Ceremonial Burial, Alphabet
    
                           -> Feudalism, Chivalry, Knight
    
         Trade             <- Currency, Code of Laws, Bronze Working, Alphabet
    
                           -> Caravan, Banking, Medicine, Bank, Shakespeare, 
                              Chemistry, Explosives, Conscription, 
                              Industrialization, Rifleman, Transport, Factory, 
                              Women's Suffrage, Steel, Corporation, Communism, 
                              Battleship, Refining, Genetic Eng., United Nations, 
                              Power Plant, Combustion, Cure for Cancer, 
                              Automobile, Cruiser, Flight, Armor, Mass Production, 
                              Fighter, Advanced Flight, Labor Union, Submarine, 
                              Mass Transit, Recycling, Nuclear Fission, Bomber, 
                              Carrier, Rocketry, Mech Infantry, Recycling Center, 
                              Manhattan Project, Nuclear Power, Nuclear Unit, 
                              Space Flight, Nuclear Plant, SS Structure, 
                              Apollo Program, Plastic, SS Component, 
                              Superconductor, Robotics, Fusion Power, SDI Defence, 
                              Artillery, Mfg Plant, SS Module
    
         Construction      <- Currency, Masonry, Bronze Working
    
                           -> Aqueduct, Colosseum, Fortress, Engineering, 
                              Bridge Building, Invention, Gunpowder, Steam Engine, 
                              Explosives, Musketeer, Metallurgy, Railroad, 
                              Ironclad, Conscription, Cannon, Electricity, 
                              Darwin's Voyage, Industrialization, Rifleman, 
                              Electronics, Transport, Factory, Women's Suffrage, 
                              Steel, Corporation, Communism, Hydro Plant, 
                              Hoover Dam, Computers, Battleship, Refining, 
                              Genetic Eng., United Nations, SETI Program, 
                              Power Plant, Combustion, Cure for Cancer, 
                              Automobile, Cruiser, Flight, Armor, Mass Production, 
                              Fighter, Advanced Flight, Labor Union, Submarine, 
                              Mass Transit, Recycling, Nuclear Fission, Bomber, 
                              Carrier, Rocketry, Mech Infantry, Recycling Center, 
                              Manhattan Project, Nuclear Power, Nuclear Unit, 
                              Space Flight, Nuclear Plant, SS Structure, 
                              Apollo Program, Plastic, SS Component, 
                              Superconductor, Robotics, Fusion Power, SDI Defence, 
                              Artillery, Mfg Plant, SS Module
    
         Astronomy         <- Mathematics, Mysticism, Masonry, Ceremonial Burial, 
                              Alphabet
    
                           -> Copernicus, Navigation, Sail, Magellan, Physics, 
                              Theory of Gravity, Magnetism, Steam Engine, 
                              Isaac Newton, Atomic Theory, Frigate, Railroad, 
                              Ironclad, Electricity, Darwin's Voyage, 
                              Industrialization, Electronics, Transport, Factory, 
                              Women's Suffrage, Steel, Corporation, Communism, 
                              Hydro Plant, Hoover Dam, Computers, Battleship, 
                              Refining, Genetic Eng., United Nations, 
                              SETI Program, Power Plant, Combustion, 
                              Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
                              Mass Production, Fighter, Advanced Flight, 
                              Labor Union, Submarine, Mass Transit, Recycling, 
                              Nuclear Fission, Bomber, Carrier, Rocketry, 
                              Mech Infantry, Recycling Center, Manhattan Project, 
                              Nuclear Power, Nuclear Unit, Space Flight, 
                              Nuclear Plant, SS Structure, Apollo Program, 
                              Plastic, SS Component, Superconductor, Robotics, 
                              Fusion Power, SDI Defence, Artillery, Mfg Plant, 
                              SS Module
    
         Republic          <- Literacy, Code of Laws, Writing, Alphabet
    
                           -> Banking, Bank, Conscription, Industrialization, 
                              Rifleman, Transport, Factory, Women's Suffrage, 
                              Steel, Corporation, Communism, Battleship, Refining, 
                              Genetic Eng., United Nations, Power Plant, 
                              Combustion, Cure for Cancer, Automobile, Cruiser, 
                              Flight, Armor, Mass Production, Fighter, 
                              Advanced Flight, Labor Union, Submarine, 
                              Mass Transit, Recycling, Nuclear Fission, Bomber, 
                              Carrier, Rocketry, Mech Infantry, Recycling Center, 
                              Manhattan Project, Nuclear Power, Nuclear Unit, 
                              Space Flight, Nuclear Plant, SS Structure, 
                              Apollo Program, Plastic, SS Component, 
                              Superconductor, Robotics, Fusion Power, SDI Defence, 
                              Artillery, Mfg Plant, SS Module
    
         Philosophy        <- Literacy, Mysticism, Code of Laws, Writing, 
                              Ceremonial Burial, Alphabet
    
                           -> Medicine, Religion, Democracy, University, 
                              Shakespeare, Cathedral, J.S. Bach, Michelangelo, 
                              Chemistry, University (Imp), Theory of Gravity, 
                              Isaac Newton, Atomic Theory, Explosives, Metallurgy, 
                              Conscription, Cannon, Electricity, Rifleman, 
                              Electronics, Steel, Communism, Hydro Plant, 
                              Hoover Dam, Computers, Battleship, Refining, 
                              Genetic Eng., United Nations, SETI Program, 
                              Power Plant, Combustion, Cure for Cancer, 
                              Automobile, Cruiser, Flight, Armor, Mass Production, 
                              Fighter, Advanced Flight, Labor Union, Submarine, 
                              Mass Transit, Recycling, Nuclear Fission, Bomber, 
                              Carrier, Rocketry, Mech Infantry, Recycling Center, 
                              Manhattan Project, Nuclear Power, Nuclear Unit, 
                              Space Flight, Nuclear Plant, SS Structure, 
                              Apollo Program, Plastic, SS Component, 
                              Superconductor, Robotics, Fusion Power, SDI Defence, 
                              Artillery, Mfg Plant, SS Module
    
         Feudalism         <- Monarchy, Code of Laws, Masonry, Ceremonial Burial, 
                              Alphabet
    
                           -> Chivalry, Knight
    
         Engineering       <- Construction, Currency, The Wheel, Masonry, 
                              Bronze Working
    
                           -> Invention, Gunpowder, Steam Engine, Explosives, 
                              Musketeer, Metallurgy, Railroad, Ironclad, 
                              Conscription, Cannon, Electricity, Darwin's Voyage, 
                              Industrialization, Rifleman, Electronics, Transport, 
                              Factory, Women's Suffrage, Steel, Corporation, 
                              Communism, Hydro Plant, Hoover Dam, Computers, 
                              Battleship, Refining, Genetic Eng., United Nations, 
                              SETI Program, Power Plant, Combustion, 
                              Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
                              Mass Production, Fighter, Advanced Flight, 
                              Labor Union, Submarine, Mass Transit, Recycling, 
                              Nuclear Fission, Bomber, Carrier, Rocketry, 
                              Mech Infantry, Recycling Center, Manhattan Project, 
                              Nuclear Power, Nuclear Unit, Space Flight, 
                              Nuclear Plant, SS Structure, Apollo Program, 
                              Plastic, SS Component, Superconductor, Robotics, 
                              Fusion Power, SDI Defence, Artillery, Mfg Plant, 
                              SS Module
    
         Bridge Building   <- Construction, Currency, Iron Working, Masonry, 
                              Bronze Working
    
                           -> Railroad, Darwin's Voyage, Industrialization, 
                              Transport, Factory, Women's Suffrage, Steel, 
                              Corporation, Communism, Battleship, Refining, 
                              Genetic Eng., United Nations, Power Plant, 
                              Combustion, Cure for Cancer, Automobile, Cruiser, 
                              Flight, Armor, Mass Production, Fighter, 
                              Advanced Flight, Labor Union, Submarine, 
                              Mass Transit, Recycling, Nuclear Fission, Bomber, 
                              Carrier, Rocketry, Mech Infantry, Recycling Center, 
                              Manhattan Project, Nuclear Power, Nuclear Unit, 
                              Space Flight, Nuclear Plant, SS Structure, 
                              Apollo Program, Plastic, SS Component, 
                              Superconductor, Robotics, Fusion Power, SDI Defence, 
                              Artillery, Mfg Plant, SS Module
    
         Navigation        <- Astronomy, Mathematics, Mysticism, Map Making, 
                              Masonry, Ceremonial Burial, Alphabet
    
                           -> Sail, Magellan, Physics, Magnetism, Steam Engine, 
                              Atomic Theory, Frigate, Railroad, Ironclad, 
                              Electricity, Darwin's Voyage, Industrialization, 
                              Electronics, Transport, Factory, Women's Suffrage, 
                              Steel, Corporation, Communism, Hydro Plant, 
                              Hoover Dam, Computers, Battleship, Refining, 
                              Genetic Eng., United Nations, SETI Program, 
                              Power Plant, Combustion, Cure for Cancer, 
                              Automobile, Cruiser, Flight, Armor, Mass Production, 
                              Fighter, Advanced Flight, Labor Union, Submarine, 
                              Mass Transit, Recycling, Nuclear Fission, Bomber, 
                              Carrier, Rocketry, Mech Infantry, Recycling Center, 
                              Manhattan Project, Nuclear Power, Nuclear Unit, 
                              Space Flight, Nuclear Plant, SS Structure, 
                              Apollo Program, Plastic, SS Component, 
                              Superconductor, Robotics, Fusion Power, SDI Defence, 
                              Artillery, Mfg Plant, SS Module
    
         Banking           <- Republic, Trade, Literacy, Currency, Code of Laws, 
                              Writing, Bronze Working, Alphabet
    
                           -> Bank, Industrialization, Transport, Factory, 
                              Women's Suffrage, Steel, Corporation, Communism, 
                              Battleship, Refining, Genetic Eng., United Nations, 
                              Power Plant, Combustion, Cure for Cancer, 
                              Automobile, Cruiser, Flight, Armor, Mass Production, 
                              Fighter, Advanced Flight, Labor Union, Submarine, 
                              Mass Transit, Recycling, Nuclear Fission, Bomber, 
                              Carrier, Rocketry, Mech Infantry, Recycling Center, 
                              Manhattan Project, Nuclear Power, Nuclear Unit, 
                              Space Flight, Nuclear Plant, SS Structure, 
                              Apollo Program, Plastic, SS Component, 
                              Superconductor, Robotics, Fusion Power, SDI Defence, 
                              Artillery, Mfg Plant, SS Module
    
         Medicine          <- Philosophy, Trade, Literacy, Mysticism, Currency, 
                              Code of Laws, Writing, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
                           -> Shakespeare, Chemistry, Explosives, Conscription, 
                              Rifleman, Refining, Genetic Eng., Power Plant, 
                              Combustion, Cure for Cancer, Automobile, Cruiser, 
                              Flight, Armor, Mass Production, Fighter, 
                              Advanced Flight, Labor Union, Submarine, 
                              Mass Transit, Recycling, Nuclear Fission, Bomber, 
                              Carrier, Rocketry, Mech Infantry, Recycling Center, 
                              Manhattan Project, Nuclear Power, Nuclear Unit, 
                              Space Flight, Nuclear Plant, SS Structure, 
                              Apollo Program, Plastic, SS Component, 
                              Superconductor, Robotics, Fusion Power, SDI Defence, 
                              Artillery, Mfg Plant, SS Module
    
         Religion          <- Philosophy, Literacy, Mysticism, Code of Laws, 
                              Writing, Ceremonial Burial, Alphabet
    
                           -> Cathedral, J.S. Bach, Michelangelo
    
         Democracy         <- Philosophy, Literacy, Mysticism, Code of Laws, 
                              Writing, Ceremonial Burial, Alphabet
    
                           -> Recycling, Recycling Center
    
         University        <- Philosophy, Literacy, Mathematics, Mysticism, 
                              Code of Laws, Writing, Masonry, Ceremonial Burial, 
                              Alphabet
    
                           -> Chemistry, University (Imp), Theory of Gravity, 
                              Isaac Newton, Atomic Theory, Explosives, Metallurgy, 
                              Conscription, Cannon, Electricity, Rifleman, 
                              Electronics, Steel, Hydro Plant, Hoover Dam, 
                              Computers, Battleship, Refining, SETI Program, 
                              Power Plant, Combustion, Automobile, Cruiser, 
                              Flight, Armor, Mass Production, Fighter, 
                              Advanced Flight, Labor Union, Submarine, 
                              Mass Transit, Recycling, Nuclear Fission, Bomber, 
                              Carrier, Rocketry, Mech Infantry, Recycling Center, 
                              Manhattan Project, Nuclear Power, Nuclear Unit, 
                              Space Flight, Nuclear Plant, SS Structure, 
                              Apollo Program, Plastic, SS Component, 
                              Superconductor, Robotics, Fusion Power, SDI Defence, 
                              Artillery, Mfg Plant, SS Module
    
         Chivalry          <- Feudalism, Monarchy, Code of Laws, Horseback Riding, 
                              Masonry, Ceremonial Burial, Alphabet
    
                           -> Knight
    
         Invention         <- Engineering, Construction, Literacy, Currency, 
                              Code of Laws, Writing, The Wheel, Masonry, 
                              Bronze Working, Alphabet
    
                           -> Gunpowder, Steam Engine, Explosives, Musketeer, 
                              Metallurgy, Railroad, Ironclad, Conscription, 
                              Cannon, Electricity, Darwin's Voyage, 
                              Industrialization, Rifleman, Electronics, Transport, 
                              Factory, Women's Suffrage, Steel, Corporation, 
                              Communism, Hydro Plant, Hoover Dam, Computers, 
                              Battleship, Refining, Genetic Eng., United Nations, 
                              SETI Program, Power Plant, Combustion, 
                              Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
                              Mass Production, Fighter, Advanced Flight, 
                              Labor Union, Submarine, Mass Transit, Recycling, 
                              Nuclear Fission, Bomber, Carrier, Rocketry, 
                              Mech Infantry, Recycling Center, Manhattan Project, 
                              Nuclear Power, Nuclear Unit, Space Flight, 
                              Nuclear Plant, SS Structure, Apollo Program, 
                              Plastic, SS Component, Superconductor, Robotics, 
                              Fusion Power, SDI Defence, Artillery, Mfg Plant, 
                              SS Module
    
         Physics           <- Navigation, Astronomy, Mathematics, Mysticism, 
                              Map Making, Masonry, Ceremonial Burial, Alphabet
    
                           -> Magnetism, Steam Engine, Atomic Theory, Frigate, 
                              Railroad, Ironclad, Electricity, Darwin's Voyage, 
                              Industrialization, Electronics, Transport, Factory, 
                              Women's Suffrage, Steel, Corporation, Communism, 
                              Hydro Plant, Hoover Dam, Computers, Battleship, 
                              Refining, Genetic Eng., United Nations, 
                              SETI Program, Power Plant, Combustion, 
                              Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
                              Mass Production, Fighter, Advanced Flight, 
                              Labor Union, Submarine, Mass Transit, Recycling, 
                              Nuclear Fission, Bomber, Carrier, Rocketry, 
                              Mech Infantry, Recycling Center, Manhattan Project, 
                              Nuclear Power, Nuclear Unit, Space Flight, 
                              Nuclear Plant, SS Structure, Apollo Program, 
                              Plastic, SS Component, Superconductor, Robotics, 
                              Fusion Power, SDI Defence, Artillery, Mfg Plant, 
                              SS Module
    
         Chemistry         <- University, Medicine, Philosophy, Trade, Literacy, 
                              Mathematics, Mysticism, Currency, Code of Laws, 
                              Writing, Masonry, Ceremonial Burial, Bronze Working, 
                              Alphabet
    
                           -> Explosives, Conscription, Rifleman, Refining, 
                              Power Plant, Combustion, Automobile, Cruiser, 
                              Flight, Armor, Mass Production, Fighter, 
                              Advanced Flight, Labor Union, Submarine, 
                              Mass Transit, Recycling, Nuclear Fission, Bomber, 
                              Carrier, Rocketry, Mech Infantry, Recycling Center, 
                              Manhattan Project, Nuclear Power, Nuclear Unit, 
                              Space Flight, Nuclear Plant, SS Structure, 
                              Apollo Program, Plastic, SS Component, 
                              Superconductor, Robotics, Fusion Power, SDI Defence, 
                              Artillery, Mfg Plant, SS Module
    
         Theory of Gravity <- University, Philosophy, Astronomy, Literacy, 
                              Mathematics, Mysticism, Code of Laws, Writing, 
                              Masonry, Ceremonial Burial, Alphabet
    
                           -> Isaac Newton, Atomic Theory, Nuclear Fission, 
                              Manhattan Project, Nuclear Power, Nuclear Plant, 
                              Fusion Power
    
         Gunpowder         <- Invention, Engineering, Construction, Literacy, 
                              Currency, Iron Working, Code of Laws, Writing, 
                              The Wheel, Masonry, Bronze Working, Alphabet
    
                           -> Explosives, Musketeer, Metallurgy, Conscription, 
                              Cannon, Electricity, Rifleman, Electronics, Steel, 
                              Hydro Plant, Hoover Dam, Computers, Battleship, 
                              SETI Program, Combustion, Automobile, Cruiser, 
                              Flight, Armor, Mass Production, Fighter, 
                              Advanced Flight, Labor Union, Submarine, 
                              Mass Transit, Recycling, Nuclear Fission, Bomber, 
                              Carrier, Rocketry, Mech Infantry, Recycling Center, 
                              Manhattan Project, Nuclear Power, Nuclear Unit, 
                              Space Flight, Nuclear Plant, SS Structure, 
                              Apollo Program, Plastic, SS Component, 
                              Superconductor, Robotics, Fusion Power, SDI Defence, 
                              Artillery, Mfg Plant, SS Module
    
         Magnetism         <- Physics, Navigation, Astronomy, Mathematics, 
                              Mysticism, Map Making, Masonry, Ceremonial Burial, 
                              Alphabet
    
                           -> Frigate, Electricity, Electronics, Hydro Plant, 
                              Hoover Dam, Computers, SETI Program, 
                              Advanced Flight, Bomber, Carrier, Rocketry, 
                              Nuclear Power, Nuclear Unit, Space Flight, 
                              Nuclear Plant, SS Structure, Apollo Program, 
                              Plastic, SS Component, Superconductor, Robotics, 
                              Fusion Power, SDI Defence, Artillery, Mfg Plant, 
                              SS Module
    
         Steam Engine      <- Physics, Invention, Navigation, Engineering, 
                              Astronomy, Construction, Literacy, Mathematics, 
                              Mysticism, Currency, Code of Laws, Writing, 
                              Map Making, The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
                           -> Railroad, Ironclad, Darwin's Voyage, 
                              Industrialization, Transport, Factory, 
                              Women's Suffrage, Steel, Corporation, Communism, 
                              Battleship, Refining, Genetic Eng., United Nations, 
                              Power Plant, Combustion, Cure for Cancer, 
                              Automobile, Cruiser, Flight, Armor, Mass Production, 
                              Fighter, Advanced Flight, Labor Union, Submarine, 
                              Mass Transit, Recycling, Nuclear Fission, Bomber, 
                              Carrier, Rocketry, Mech Infantry, Recycling Center, 
                              Manhattan Project, Nuclear Power, Nuclear Unit, 
                              Space Flight, Nuclear Plant, SS Structure, 
                              Apollo Program, Plastic, SS Component, 
                              Superconductor, Robotics, Fusion Power, SDI Defence, 
                              Artillery, Mfg Plant, SS Module
    
         Atomic Theory     <- Theory of Gravity, Physics, University, Navigation, 
                              Philosophy, Astronomy, Literacy, Mathematics, 
                              Mysticism, Code of Laws, Writing, Map Making, 
                              Masonry, Ceremonial Burial, Alphabet
    
                           -> Nuclear Fission, Manhattan Project, Nuclear Power, 
                              Nuclear Plant, Fusion Power
    
         Explosives        <- Gunpowder, Chemistry, Invention, University, 
                              Medicine, Engineering, Philosophy, Construction, 
                              Trade, Literacy, Mathematics, Mysticism, Currency, 
                              Iron Working, Code of Laws, Writing, The Wheel, 
                              Masonry, Ceremonial Burial, Bronze Working, 
                              Alphabet
    
                           -> Conscription, Rifleman, Combustion, Automobile, 
                              Cruiser, Flight, Armor, Mass Production, Fighter, 
                              Advanced Flight, Labor Union, Submarine, 
                              Mass Transit, Recycling, Nuclear Fission, Bomber, 
                              Carrier, Rocketry, Mech Infantry, Recycling Center, 
                              Manhattan Project, Nuclear Power, Nuclear Unit, 
                              Space Flight, Nuclear Plant, SS Structure, 
                              Apollo Program, Plastic, SS Component, 
                              Superconductor, Robotics, Fusion Power, SDI Defence, 
                              Artillery, Mfg Plant, SS Module
    
         Metallurgy        <- Gunpowder, Invention, University, Engineering, 
                              Philosophy, Construction, Literacy, Mathematics, 
                              Mysticism, Currency, Iron Working, Code of Laws, 
                              Writing, The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
                           -> Cannon, Electricity, Electronics, Steel, 
                              Hydro Plant, Hoover Dam, Computers, Battleship, 
                              SETI Program, Automobile, Armor, Mass Production, 
                              Advanced Flight, Labor Union, Submarine, 
                              Mass Transit, Recycling, Nuclear Fission, Bomber, 
                              Carrier, Rocketry, Mech Infantry, Recycling Center, 
                              Manhattan Project, Nuclear Power, Nuclear Unit, 
                              Space Flight, Nuclear Plant, SS Structure, 
                              Apollo Program, Plastic, SS Component, 
                              Superconductor, Robotics, Fusion Power, SDI Defence, 
                              Artillery, Mfg Plant, SS Module
    
         Railroad          <- Steam Engine, Physics, Invention, Navigation, 
                              Bridge Building, Engineering, Astronomy, 
                              Construction, Literacy, Mathematics, Mysticism, 
                              Currency, Iron Working, Code of Laws, Writing, 
                              Map Making, The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
                           -> Darwin's Voyage, Industrialization, Transport, 
                              Factory, Women's Suffrage, Steel, Corporation, 
                              Communism, Battleship, Refining, Genetic Eng., 
                              United Nations, Power Plant, Combustion, 
                              Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
                              Mass Production, Fighter, Advanced Flight, 
                              Labor Union, Submarine, Mass Transit, Recycling, 
                              Nuclear Fission, Bomber, Carrier, Rocketry, 
                              Mech Infantry, Recycling Center, Manhattan Project, 
                              Nuclear Power, Nuclear Unit, Space Flight, 
                              Nuclear Plant, SS Structure, Apollo Program, 
                              Plastic, SS Component, Superconductor, Robotics, 
                              Fusion Power, SDI Defence, Artillery, Mfg Plant, 
                              SS Module
    
         Conscription      <- Explosives, Gunpowder, Chemistry, Invention, 
                              University, Medicine, Engineering, Philosophy, 
                              Republic, Construction, Trade, Literacy, 
                              Mathematics, Mysticism, Currency, Iron Working, 
                              Code of Laws, Writing, The Wheel, Masonry, 
                              Ceremonial Burial, Bronze Working, Alphabet
    
                           -> Rifleman
    
         Electricity       <- Metallurgy, Magnetism, Gunpowder, Physics, 
                              Invention, University, Navigation, Engineering, 
                              Philosophy, Astronomy, Construction, Literacy, 
                              Mathematics, Mysticism, Currency, Iron Working, 
                              Code of Laws, Writing, Map Making, The Wheel, 
                              Masonry, Ceremonial Burial, Bronze Working, 
                              Alphabet
    
                           -> Electronics, Hydro Plant, Hoover Dam, Computers, 
                              SETI Program, Advanced Flight, Bomber, Carrier, 
                              Rocketry, Nuclear Power, Nuclear Unit, Space Flight, 
                              Nuclear Plant, SS Structure, Apollo Program, 
                              Plastic, SS Component, Superconductor, Robotics, 
                              Fusion Power, SDI Defence, Artillery, Mfg Plant, 
                              SS Module
    
         Industrialization <- Railroad, Steam Engine, Physics, Invention, Banking, 
                              Navigation, Bridge Building, Engineering, Republic, 
                              Astronomy, Construction, Trade, Literacy, 
                              Mathematics, Mysticism, Currency, Iron Working, 
                              Code of Laws, Writing, Map Making, The Wheel, 
                              Masonry, Ceremonial Burial, Bronze Working, 
                              Alphabet
    
                           -> Transport, Factory, Women's Suffrage, Steel, 
                              Corporation, Communism, Battleship, Refining, 
                              Genetic Eng., United Nations, Power Plant, 
                              Combustion, Cure for Cancer, Automobile, Cruiser, 
                              Flight, Armor, Mass Production, Fighter, 
                              Advanced Flight, Labor Union, Submarine, 
                              Mass Transit, Recycling, Nuclear Fission, Bomber, 
                              Carrier, Rocketry, Mech Infantry, Recycling Center, 
                              Manhattan Project, Nuclear Power, Nuclear Unit, 
                              Space Flight, Nuclear Plant, SS Structure, 
                              Apollo Program, Plastic, SS Component, 
                              Superconductor, Robotics, Fusion Power, SDI Defence, 
                              Artillery, Mfg Plant, SS Module
    
         Electronics       <- Electricity, Metallurgy, Magnetism, Gunpowder, 
                              Physics, Invention, University, Navigation, 
                              Engineering, Philosophy, Astronomy, Construction, 
                              Literacy, Mathematics, Mysticism, Currency, 
                              Iron Working, Code of Laws, Writing, Map Making, 
                              The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
                           -> Hydro Plant, Hoover Dam, Computers, SETI Program, 
                              Rocketry, Nuclear Power, Nuclear Unit, Space Flight, 
                              Nuclear Plant, SS Structure, Apollo Program, 
                              Plastic, SS Component, Superconductor, Robotics, 
                              Fusion Power, SDI Defence, Artillery, Mfg Plant, 
                              SS Module
    
         Steel             <- Industrialization, Railroad, Metallurgy, 
                              Steam Engine, Gunpowder, Physics, Invention, 
                              University, Banking, Navigation, Bridge Building, 
                              Engineering, Philosophy, Republic, Astronomy, 
                              Construction, Trade, Literacy, Mathematics, 
                              Mysticism, Currency, Iron Working, Code of Laws, 
                              Writing, Map Making, The Wheel, Masonry, 
                              Ceremonial Burial, Bronze Working, Alphabet
    
                           -> Battleship, Automobile, Armor, Mass Production, 
                              Labor Union, Submarine, Mass Transit, Recycling, 
                              Nuclear Fission, Mech Infantry, Recycling Center, 
                              Manhattan Project, Nuclear Power, Nuclear Plant, 
                              Superconductor, Fusion Power, SDI Defence
    
         Corporation       <- Industrialization, Railroad, Steam Engine, Physics, 
                              Invention, Banking, Navigation, Bridge Building, 
                              Engineering, Republic, Astronomy, Construction, 
                              Trade, Literacy, Mathematics, Mysticism, Currency, 
                              Iron Working, Code of Laws, Writing, Map Making, 
                              The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
                           -> Refining, Genetic Eng., Power Plant, Combustion, 
                              Cure for Cancer, Automobile, Cruiser, Flight, Armor, 
                              Mass Production, Fighter, Advanced Flight, 
                              Labor Union, Submarine, Mass Transit, Recycling, 
                              Nuclear Fission, Bomber, Carrier, Rocketry, 
                              Mech Infantry, Recycling Center, Manhattan Project, 
                              Nuclear Power, Nuclear Unit, Space Flight, 
                              Nuclear Plant, SS Structure, Apollo Program, 
                              Plastic, SS Component, Superconductor, Robotics, 
                              Fusion Power, SDI Defence, Artillery, Mfg Plant, 
                              SS Module
    
         Communism         <- Industrialization, Railroad, Steam Engine, Physics, 
                              Invention, Banking, Navigation, Bridge Building, 
                              Engineering, Philosophy, Republic, Astronomy, 
                              Construction, Trade, Literacy, Mathematics, 
                              Mysticism, Currency, Iron Working, Code of Laws, 
                              Writing, Map Making, The Wheel, Masonry, 
                              Ceremonial Burial, Bronze Working, Alphabet
    
                           -> United Nations, Labor Union, Mech Infantry
    
         Computers         <- Electronics, Electricity, Metallurgy, Magnetism, 
                              Gunpowder, Physics, Invention, University, 
                              Navigation, Engineering, Philosophy, Astronomy, 
                              Construction, Literacy, Mathematics, Mysticism, 
                              Currency, Iron Working, Code of Laws, Writing, 
                              Map Making, The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
                           -> SETI Program, Space Flight, SS Structure, 
                              Apollo Program, Plastic, SS Component, 
                              Superconductor, Robotics, Fusion Power, SDI Defence, 
                              Artillery, Mfg Plant, SS Module
    
         Refining          <- Corporation, Industrialization, Railroad, 
                              Steam Engine, Chemistry, Physics, Invention, 
                              University, Medicine, Banking, Navigation, 
                              Bridge Building, Engineering, Philosophy, Republic, 
                              Astronomy, Construction, Trade, Literacy, 
                              Mathematics, Mysticism, Currency, Iron Working, 
                              Code of Laws, Writing, Map Making, The Wheel, 
                              Masonry, Ceremonial Burial, Bronze Working, 
                              Alphabet
    
                           -> Power Plant, Combustion, Automobile, Cruiser, 
                              Flight, Armor, Mass Production, Fighter, 
                              Advanced Flight, Labor Union, Submarine, 
                              Mass Transit, Recycling, Nuclear Fission, Bomber, 
                              Carrier, Rocketry, Mech Infantry, Recycling Center, 
                              Manhattan Project, Nuclear Power, Nuclear Unit, 
                              Space Flight, Nuclear Plant, SS Structure, 
                              Apollo Program, Plastic, SS Component, 
                              Superconductor, Robotics, Fusion Power, SDI Defence, 
                              Artillery, Mfg Plant, SS Module
    
         Genetic Eng.      <- Corporation, Industrialization, Railroad, 
                              Steam Engine, Physics, Invention, Medicine, Banking, 
                              Navigation, Bridge Building, Engineering, 
                              Philosophy, Republic, Astronomy, Construction, 
                              Trade, Literacy, Mathematics, Mysticism, Currency, 
                              Iron Working, Code of Laws, Writing, Map Making, 
                              The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
                           -> Cure for Cancer
    
         Combustion        <- Refining, Corporation, Industrialization, Railroad, 
                              Explosives, Steam Engine, Gunpowder, Chemistry, 
                              Physics, Invention, University, Medicine, Banking, 
                              Navigation, Bridge Building, Engineering, 
                              Philosophy, Republic, Astronomy, Construction, 
                              Trade, Literacy, Mathematics, Mysticism, Currency, 
                              Iron Working, Code of Laws, Writing, Map Making, 
                              The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
                           -> Automobile, Cruiser, Flight, Armor, Mass Production, 
                              Fighter, Advanced Flight, Labor Union, Submarine, 
                              Mass Transit, Recycling, Nuclear Fission, Bomber, 
                              Carrier, Rocketry, Mech Infantry, Recycling Center, 
                              Manhattan Project, Nuclear Power, Nuclear Unit, 
                              Space Flight, Nuclear Plant, SS Structure, 
                              Apollo Program, Plastic, SS Component, 
                              Superconductor, Robotics, Fusion Power, SDI Defence, 
                              Artillery, Mfg Plant, SS Module
    
         Automobile        <- Combustion, Refining, Corporation, Steel, 
                              Industrialization, Railroad, Metallurgy, Explosives, 
                              Steam Engine, Gunpowder, Chemistry, Physics, 
                              Invention, University, Medicine, Banking, 
                              Navigation, Bridge Building, Engineering, 
                              Philosophy, Republic, Astronomy, Construction, 
                              Trade, Literacy, Mathematics, Mysticism, Currency, 
                              Iron Working, Code of Laws, Writing, Map Making, 
                              The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
                           -> Armor, Mass Production, Labor Union, Submarine, 
                              Mass Transit, Recycling, Nuclear Fission, 
                              Mech Infantry, Recycling Center, Manhattan Project, 
                              Nuclear Power, Nuclear Plant, Superconductor, 
                              Fusion Power, SDI Defence
    
         Flight            <- Combustion, Refining, Corporation, 
                              Industrialization, Railroad, Explosives, 
                              Steam Engine, Gunpowder, Chemistry, Physics, 
                              Invention, University, Medicine, Banking, 
                              Navigation, Bridge Building, Engineering, 
                              Philosophy, Republic, Astronomy, Construction, 
                              Trade, Literacy, Mathematics, Mysticism, Currency, 
                              Iron Working, Code of Laws, Writing, Map Making, 
                              The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
                           -> Fighter, Advanced Flight, Bomber, Carrier, Rocketry, 
                              Nuclear Unit, Space Flight, SS Structure, 
                              Apollo Program, Plastic, SS Component, 
                              Superconductor, Robotics, Fusion Power, SDI Defence, 
                              Artillery, Mfg Plant, SS Module
    
         Mass Production   <- Automobile, Combustion, Refining, Corporation, 
                              Steel, Industrialization, Railroad, Metallurgy, 
                              Explosives, Steam Engine, Gunpowder, Chemistry, 
                              Physics, Invention, University, Medicine, Banking, 
                              Navigation, Bridge Building, Engineering, 
                              Philosophy, Republic, Astronomy, Construction, 
                              Trade, Literacy, Mathematics, Mysticism, Currency, 
                              Iron Working, Code of Laws, Writing, Map Making, 
                              The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
                           -> Labor Union, Submarine, Mass Transit, Recycling, 
                              Nuclear Fission, Mech Infantry, Recycling Center, 
                              Manhattan Project, Nuclear Power, Nuclear Plant, 
                              Superconductor, Fusion Power, SDI Defence
    
         Advanced Flight   <- Flight, Combustion, Refining, Corporation, 
                              Industrialization, Electricity, Railroad, 
                              Metallurgy, Explosives, Steam Engine, Magnetism, 
                              Gunpowder, Chemistry, Physics, Invention, 
                              University, Medicine, Banking, Navigation, 
                              Bridge Building, Engineering, Philosophy, Republic, 
                              Astronomy, Construction, Trade, Literacy, 
                              Mathematics, Mysticism, Currency, Iron Working, 
                              Code of Laws, Writing, Map Making, The Wheel, 
                              Masonry, Ceremonial Burial, Bronze Working, 
                              Alphabet
    
                           -> Bomber, Carrier, Rocketry, Nuclear Unit, 
                              Space Flight, SS Structure, Apollo Program, Plastic, 
                              SS Component, Superconductor, Robotics, 
                              Fusion Power, SDI Defence, Artillery, Mfg Plant, 
                              SS Module
    
         Labor Union       <- Mass Production, Automobile, Combustion, Refining, 
                              Communism, Corporation, Steel, Industrialization, 
                              Railroad, Metallurgy, Explosives, Steam Engine, 
                              Gunpowder, Chemistry, Physics, Invention, 
                              University, Medicine, Banking, Navigation, 
                              Bridge Building, Engineering, Philosophy, Republic, 
                              Astronomy, Construction, Trade, Literacy, 
                              Mathematics, Mysticism, Currency, Iron Working, 
                              Code of Laws, Writing, Map Making, The Wheel, 
                              Masonry, Ceremonial Burial, Bronze Working, 
                              Alphabet
    
                           -> Mech Infantry
    
         Recycling         <- Mass Production, Automobile, Combustion, Refining, 
                              Corporation, Steel, Industrialization, Railroad, 
                              Metallurgy, Explosives, Steam Engine, Gunpowder, 
                              Chemistry, Physics, Invention, University, 
                              Democracy, Medicine, Banking, Navigation, 
                              Bridge Building, Engineering, Philosophy, Republic, 
                              Astronomy, Construction, Trade, Literacy, 
                              Mathematics, Mysticism, Currency, Iron Working, 
                              Code of Laws, Writing, Map Making, The Wheel, 
                              Masonry, Ceremonial Burial, Bronze Working, 
                              Alphabet
    
                           -> Recycling Center
    
         Nuclear Fission   <- Mass Production, Automobile, Combustion, Refining, 
                              Corporation, Steel, Industrialization, Railroad, 
                              Metallurgy, Explosives, Atomic Theory, Steam Engine, 
                              Gunpowder, Theory of Gravity, Chemistry, Physics, 
                              Invention, University, Medicine, Banking, 
                              Navigation, Bridge Building, Engineering, 
                              Philosophy, Republic, Astronomy, Construction, 
                              Trade, Literacy, Mathematics, Mysticism, Currency, 
                              Iron Working, Code of Laws, Writing, Map Making, 
                              The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
                           -> Manhattan Project, Nuclear Power, Nuclear Plant, 
                              Fusion Power
    
         Rocketry          <- Advanced Flight, Flight, Combustion, Refining, 
                              Corporation, Electronics, Industrialization, 
                              Electricity, Railroad, Metallurgy, Explosives, 
                              Steam Engine, Magnetism, Gunpowder, Chemistry, 
                              Physics, Invention, University, Medicine, Banking, 
                              Navigation, Bridge Building, Engineering, 
                              Philosophy, Republic, Astronomy, Construction, 
                              Trade, Literacy, Mathematics, Mysticism, Currency, 
                              Iron Working, Code of Laws, Writing, Map Making, 
                              The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
                           -> Nuclear Unit, Space Flight, SS Structure, 
                              Apollo Program, Plastic, SS Component, 
                              Superconductor, Robotics, Fusion Power, SDI Defence, 
                              Artillery, Mfg Plant, SS Module
    
         Nuclear Power     <- Nuclear Fission, Mass Production, Automobile, 
                              Combustion, Refining, Corporation, Steel, 
                              Electronics, Industrialization, Electricity, 
                              Railroad, Metallurgy, Explosives, Atomic Theory, 
                              Steam Engine, Magnetism, Gunpowder, 
                              Theory of Gravity, Chemistry, Physics, Invention, 
                              University, Medicine, Banking, Navigation, 
                              Bridge Building, Engineering, Philosophy, Republic, 
                              Astronomy, Construction, Trade, Literacy, 
                              Mathematics, Mysticism, Currency, Iron Working, 
                              Code of Laws, Writing, Map Making, The Wheel, 
                              Masonry, Ceremonial Burial, Bronze Working, 
                              Alphabet
    
                           -> Nuclear Plant, Fusion Power
    
         Space Flight      <- Rocketry, Advanced Flight, Flight, Combustion, 
                              Refining, Computers, Corporation, Electronics, 
                              Industrialization, Electricity, Railroad, 
                              Metallurgy, Explosives, Steam Engine, Magnetism, 
                              Gunpowder, Chemistry, Physics, Invention, 
                              University, Medicine, Banking, Navigation, 
                              Bridge Building, Engineering, Philosophy, Republic, 
                              Astronomy, Construction, Trade, Literacy, 
                              Mathematics, Mysticism, Currency, Iron Working, 
                              Code of Laws, Writing, Map Making, The Wheel, 
                              Masonry, Ceremonial Burial, Bronze Working, 
                              Alphabet
    
                           -> SS Structure, Apollo Program, Plastic, SS Component, 
                              Superconductor, Robotics, Fusion Power, SDI Defence, 
                              Artillery, Mfg Plant, SS Module
    
         Plastic           <- Space Flight, Rocketry, Advanced Flight, Flight, 
                              Combustion, Refining, Computers, Corporation, 
                              Electronics, Industrialization, Electricity, 
                              Railroad, Metallurgy, Explosives, Steam Engine, 
                              Magnetism, Gunpowder, Chemistry, Physics, Invention, 
                              University, Medicine, Banking, Navigation, 
                              Bridge Building, Engineering, Philosophy, Republic, 
                              Astronomy, Construction, Trade, Literacy, 
                              Mathematics, Mysticism, Currency, Iron Working, 
                              Code of Laws, Writing, Map Making, The Wheel, 
                              Masonry, Ceremonial Burial, Bronze Working, 
                              Alphabet
    
                           -> SS Component, Superconductor, Robotics, 
                              Fusion Power, SDI Defence, Artillery, Mfg Plant, 
                              SS Module
    
         Superconductor    <- Plastic, Space Flight, Rocketry, Advanced Flight, 
                              Mass Production, Flight, Automobile, Combustion, 
                              Refining, Computers, Corporation, Steel, 
                              Electronics, Industrialization, Electricity, 
                              Railroad, Metallurgy, Explosives, Steam Engine, 
                              Magnetism, Gunpowder, Chemistry, Physics, Invention, 
                              University, Medicine, Banking, Navigation, 
                              Bridge Building, Engineering, Philosophy, Republic, 
                              Astronomy, Construction, Trade, Literacy, 
                              Mathematics, Mysticism, Currency, Iron Working, 
                              Code of Laws, Writing, Map Making, The Wheel, 
                              Masonry, Ceremonial Burial, Bronze Working, 
                              Alphabet
    
                           -> Fusion Power, SDI Defence
    
         Robotics          <- Plastic, Space Flight, Rocketry, Advanced Flight, 
                              Flight, Combustion, Refining, Computers, 
                              Corporation, Electronics, Industrialization, 
                              Electricity, Railroad, Metallurgy, Explosives, 
                              Steam Engine, Magnetism, Gunpowder, Chemistry, 
                              Physics, Invention, University, Medicine, Banking, 
                              Navigation, Bridge Building, Engineering, 
                              Philosophy, Republic, Astronomy, Construction, 
                              Trade, Literacy, Mathematics, Mysticism, Currency, 
                              Iron Working, Code of Laws, Writing, Map Making, 
                              The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
                           -> Artillery, Mfg Plant, SS Module
    
         Fusion Power      <- Superconductor, Plastic, Space Flight, 
                              Nuclear Power, Rocketry, Nuclear Fission, 
                              Advanced Flight, Mass Production, Flight, 
                              Automobile, Combustion, Refining, Computers, 
                              Corporation, Steel, Electronics, Industrialization, 
                              Electricity, Railroad, Metallurgy, Explosives, 
                              Atomic Theory, Steam Engine, Magnetism, Gunpowder, 
                              Theory of Gravity, Chemistry, Physics, Invention, 
                              University, Medicine, Banking, Navigation, 
                              Bridge Building, Engineering, Philosophy, Republic, 
                              Astronomy, Construction, Trade, Literacy, 
                              Mathematics, Mysticism, Currency, Iron Working, 
                              Code of Laws, Writing, Map Making, The Wheel, 
                              Masonry, Ceremonial Burial, Bronze Working, 
                              Alphabet
    
    
    
         IMPROVEMENTS
         ------------
    
         Temple            <- Ceremonial Burial
    
         Palace            <- Masonry
    
         City Wall         <- Masonry
    
         Granary           <- Pottery
    
         Library           <- Writing, Alphabet
    
         Courthouse        <- Code of Laws, Alphabet
    
         Marketplace       <- Currency, Bronze Working
    
         Aqueduct          <- Construction, Currency, Masonry, Bronze Working
    
         Colosseum         <- Construction, Currency, Masonry, Bronze Working
    
         Fortress          <- Construction, Currency, Masonry, Bronze Working
    
         Bank              <- Banking, Republic, Trade, Literacy, Currency, 
                              Code of Laws, Writing, Bronze Working, Alphabet
    
         Cathedral         <- Religion, Philosophy, Literacy, Mysticism, 
                              Code of Laws, Writing, Ceremonial Burial, Alphabet
    
         University (Imp)  <- University, Philosophy, Literacy, Mathematics, 
                              Mysticism, Code of Laws, Writing, Masonry, 
                              Ceremonial Burial, Alphabet
    
         Factory           <- Industrialization, Railroad, Steam Engine, Physics, 
                              Invention, Banking, Navigation, Bridge Building, 
                              Engineering, Republic, Astronomy, Construction, 
                              Trade, Literacy, Mathematics, Mysticism, Currency, 
                              Iron Working, Code of Laws, Writing, Map Making, 
                              The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
         Hydro Plant       <- Electronics, Electricity, Metallurgy, Magnetism, 
                              Gunpowder, Physics, Invention, University, 
                              Navigation, Engineering, Philosophy, Astronomy, 
                              Construction, Literacy, Mathematics, Mysticism, 
                              Currency, Iron Working, Code of Laws, Writing, 
                              Map Making, The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
         Power Plant       <- Refining, Corporation, Industrialization, Railroad, 
                              Steam Engine, Chemistry, Physics, Invention, 
                              University, Medicine, Banking, Navigation, 
                              Bridge Building, Engineering, Philosophy, Republic, 
                              Astronomy, Construction, Trade, Literacy, 
                              Mathematics, Mysticism, Currency, Iron Working, 
                              Code of Laws, Writing, Map Making, The Wheel, 
                              Masonry, Ceremonial Burial, Bronze Working, 
                              Alphabet
    
         Mass Transit      <- Mass Production, Automobile, Combustion, Refining, 
                              Corporation, Steel, Industrialization, Railroad, 
                              Metallurgy, Explosives, Steam Engine, Gunpowder, 
                              Chemistry, Physics, Invention, University, Medicine, 
                              Banking, Navigation, Bridge Building, Engineering, 
                              Philosophy, Republic, Astronomy, Construction, 
                              Trade, Literacy, Mathematics, Mysticism, Currency, 
                              Iron Working, Code of Laws, Writing, Map Making, 
                              The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
         Recycling Center  <- Recycling, Mass Production, Automobile, Combustion, 
                              Refining, Corporation, Steel, Industrialization, 
                              Railroad, Metallurgy, Explosives, Steam Engine, 
                              Gunpowder, Chemistry, Physics, Invention, 
                              University, Democracy, Medicine, Banking, 
                              Navigation, Bridge Building, Engineering, 
                              Philosophy, Republic, Astronomy, Construction, 
                              Trade, Literacy, Mathematics, Mysticism, Currency, 
                              Iron Working, Code of Laws, Writing, Map Making, 
                              The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
         Nuclear Plant     <- Nuclear Power, Nuclear Fission, Mass Production, 
                              Automobile, Combustion, Refining, Corporation, 
                              Steel, Electronics, Industrialization, Electricity, 
                              Railroad, Metallurgy, Explosives, Atomic Theory, 
                              Steam Engine, Magnetism, Gunpowder, 
                              Theory of Gravity, Chemistry, Physics, Invention, 
                              University, Medicine, Banking, Navigation, 
                              Bridge Building, Engineering, Philosophy, Republic, 
                              Astronomy, Construction, Trade, Literacy, 
                              Mathematics, Mysticism, Currency, Iron Working, 
                              Code of Laws, Writing, Map Making, The Wheel, 
                              Masonry, Ceremonial Burial, Bronze Working, 
                              Alphabet
    
         SS Structure      <- Space Flight, Rocketry, Advanced Flight, Flight, 
                              Combustion, Refining, Computers, Corporation, 
                              Electronics, Industrialization, Electricity, 
                              Railroad, Metallurgy, Explosives, Steam Engine, 
                              Magnetism, Gunpowder, Chemistry, Physics, Invention, 
                              University, Medicine, Banking, Navigation, 
                              Bridge Building, Engineering, Philosophy, Republic, 
                              Astronomy, Construction, Trade, Literacy, 
                              Mathematics, Mysticism, Currency, Iron Working, 
                              Code of Laws, Writing, Map Making, The Wheel, 
                              Masonry, Ceremonial Burial, Bronze Working, 
                              Alphabet
    
         SS Component      <- Plastic, Space Flight, Rocketry, Advanced Flight, 
                              Flight, Combustion, Refining, Computers, 
                              Corporation, Electronics, Industrialization, 
                              Electricity, Railroad, Metallurgy, Explosives, 
                              Steam Engine, Magnetism, Gunpowder, Chemistry, 
                              Physics, Invention, University, Medicine, Banking, 
                              Navigation, Bridge Building, Engineering, 
                              Philosophy, Republic, Astronomy, Construction, 
                              Trade, Literacy, Mathematics, Mysticism, Currency, 
                              Iron Working, Code of Laws, Writing, Map Making, 
                              The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
         SDI Defence       <- Superconductor, Plastic, Space Flight, Rocketry, 
                              Advanced Flight, Mass Production, Flight, 
                              Automobile, Combustion, Refining, Computers, 
                              Corporation, Steel, Electronics, Industrialization, 
                              Electricity, Railroad, Metallurgy, Explosives, 
                              Steam Engine, Magnetism, Gunpowder, Chemistry, 
                              Physics, Invention, University, Medicine, Banking, 
                              Navigation, Bridge Building, Engineering, 
                              Philosophy, Republic, Astronomy, Construction, 
                              Trade, Literacy, Mathematics, Mysticism, Currency, 
                              Iron Working, Code of Laws, Writing, Map Making, 
                              The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
         Mfg Plant         <- Robotics, Plastic, Space Flight, Rocketry, 
                              Advanced Flight, Flight, Combustion, Refining, 
                              Computers, Corporation, Electronics, 
                              Industrialization, Electricity, Railroad, 
                              Metallurgy, Explosives, Steam Engine, Magnetism, 
                              Gunpowder, Chemistry, Physics, Invention, 
                              University, Medicine, Banking, Navigation, 
                              Bridge Building, Engineering, Philosophy, Republic, 
                              Astronomy, Construction, Trade, Literacy, 
                              Mathematics, Mysticism, Currency, Iron Working, 
                              Code of Laws, Writing, Map Making, The Wheel, 
                              Masonry, Ceremonial Burial, Bronze Working, 
                              Alphabet
    
         SS Module         <- Robotics, Plastic, Space Flight, Rocketry, 
                              Advanced Flight, Flight, Combustion, Refining, 
                              Computers, Corporation, Electronics, 
                              Industrialization, Electricity, Railroad, 
                              Metallurgy, Explosives, Steam Engine, Magnetism, 
                              Gunpowder, Chemistry, Physics, Invention, 
                              University, Medicine, Banking, Navigation, 
                              Bridge Building, Engineering, Philosophy, Republic, 
                              Astronomy, Construction, Trade, Literacy, 
                              Mathematics, Mysticism, Currency, Iron Working, 
                              Code of Laws, Writing, Map Making, The Wheel, 
                              Masonry, Ceremonial Burial, Bronze Working, 
                              Alphabet
    
    
    
         WONDERS OF THE WORLD
         --------------------
    
         Pyramids          <- Masonry
    
         Great Wall        <- Masonry
    
         Hanging Garden    <- Pottery
    
         Lighthouse        <- MapMaking, Alphabet
    
         Oracle            <- Mysticism, Ceremonial Burial
    
         Great Library     <- Literacy, Code of Laws, Writing, Alphabet
    
         Copernicus        <- Astronomy, Mathematics, Mysticism, Masonry, 
                              Ceremonial Burial, Alphabet
    
         Magellan          <- Navigation, Astronomy, Mathematics, Mysticism, 
                              Map Making, Masonry, Ceremonial Burial, Alphabet
    
         Shakespeare       <- Medicine, Philosophy, Trade, Literacy, Mysticism, 
                              Currency, Code of Laws, Writing, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
         J.S. Bach         <- Religion, Philosophy, Literacy, Mysticism, 
                              Code of Laws, Writing, Ceremonial Burial, Alphabet
    
         Michelangelo      <- Religion, Philosophy, Literacy, Mysticism, 
                              Code of Laws, Writing, Ceremonial Burial, Alphabet
    
         Isaac Newton      <- Theory of Gravity, University, Philosophy, 
                              Astronomy, Literacy, Mathematics, Mysticism, 
                              Code of Laws, Writing, Masonry, Ceremonial Burial, 
                              Alphabet
    
         Darwin's Voyage   <- Railroad, Steam Engine, Physics, Invention, 
                              Navigation, Bridge Building, Engineering, Astronomy, 
                              Construction, Literacy, Mathematics, Mysticism, 
                              Currency, Iron Working, Code of Laws, Writing, 
                              Map Making, The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
         Women's Suffrage  <- Industrialization, Railroad, Steam Engine, Physics, 
                              Invention, Banking, Navigation, Bridge Building, 
                              Engineering, Republic, Astronomy, Construction, 
                              Trade, Literacy, Mathematics, Mysticism, Currency, 
                              Iron Working, Code of Laws, Writing, Map Making, 
                              The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
         Hoover Dam        <- Electronics, Electricity, Metallurgy, Magnetism, 
                              Gunpowder, Physics, Invention, University, 
                              Navigation, Engineering, Philosophy, Astronomy, 
                              Construction, Literacy, Mathematics, Mysticism, 
                              Currency, Iron Working, Code of Laws, Writing, 
                              Map Making, The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
         United Nations    <- Communism, Industrialization, Railroad, 
                              Steam Engine, Physics, Invention, Banking, 
                              Navigation, Bridge Building, Engineering, 
                              Philosophy, Republic, Astronomy, Construction, 
                              Trade, Literacy, Mathematics, Mysticism, Currency, 
                              Iron Working, Code of Laws, Writing, Map Making, 
                              The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
         SETI Program      <- Computers, Electronics, Electricity, Metallurgy, 
                              Magnetism, Gunpowder, Physics, Invention, 
                              University, Navigation, Engineering, Philosophy, 
                              Astronomy, Construction, Literacy, Mathematics, 
                              Mysticism, Currency, Iron Working, Code of Laws, 
                              Writing, Map Making, The Wheel, Masonry, 
                              Ceremonial Burial, Bronze Working, Alphabet
    
         Cure for Cancer   <- Genetic Eng., Corporation, Industrialization, 
                              Railroad, Steam Engine, Physics, Invention, 
                              Medicine, Banking, Navigation, Bridge Building, 
                              Engineering, Philosophy, Republic, Astronomy, 
                              Construction, Trade, Literacy, Mathematics, 
                              Mysticism, Currency, Iron Working, Code of Laws, 
                              Writing, Map Making, The Wheel, Masonry, 
                              Ceremonial Burial, Bronze Working, Alphabet
    
         Manhattan Project <- Nuclear Fission, Mass Production, Automobile, 
                              Combustion, Refining, Corporation, Steel, 
                              Industrialization, Railroad, Metallurgy, Explosives, 
                              Atomic Theory, Steam Engine, Gunpowder, 
                              Theory of Gravity, Chemistry, Physics, Invention, 
                              University, Medicine, Banking, Navigation, 
                              Bridge Building, Engineering, Philosophy, Republic, 
                              Astronomy, Construction, Trade, Literacy, 
                              Mathematics, Mysticism, Currency, Iron Working, 
                              Code of Laws, Writing, Map Making, The Wheel, 
                              Masonry, Ceremonial Burial, Bronze Working, 
                              Alphabet
    
         Apollo Program    <- Space Flight, Rocketry, Advanced Flight, Flight, 
                              Combustion, Refining, Computers, Corporation, 
                              Electronics, Industrialization, Electricity, 
                              Railroad, Metallurgy, Explosives, Steam Engine, 
                              Magnetism, Gunpowder, Chemistry, Physics, Invention, 
                              University, Medicine, Banking, Navigation, 
                              Bridge Building, Engineering, Philosophy, Republic, 
                              Astronomy, Construction, Trade, Literacy, 
                              Mathematics, Mysticism, Currency, Iron Working, 
                              Code of Laws, Writing, Map Making, The Wheel, 
                              Masonry, Ceremonial Burial, Bronze Working, 
                              Alphabet
    
    
    
         UNITS
         -----
    
         Chariot           <- The Wheel
    
         Cavalry           <- Horseback Riding
    
         Diplomat          <- Writing, Alphabet
    
         Trireme           <- MapMaking, Alphabet
    
         Legion            <- Iron Working, Bronze Working
    
         Catapult          <- Mathematics, Masonry, Alphabet
    
         Caravan           <- Trade, Currency, Code of Laws, Bronze Working, 
                              Alphabet
    
         Sail              <- Navigation, Astronomy, Mathematics, Mysticism, 
                              Map Making, Masonry, Ceremonial Burial, Alphabet
    
         Knight            <- Chivalry, Feudalism, Monarchy, Code of Laws, 
                              Horseback Riding, Masonry, Ceremonial Burial, 
                              Alphabet
    
         Musketeer         <- Gunpowder, Invention, Engineering, Construction, 
                              Literacy, Currency, Iron Working, Code of Laws, 
                              Writing, The Wheel, Masonry, Bronze Working, 
                              Alphabet
    
         Frigate           <- Magnetism, Physics, Navigation, Astronomy, 
                              Mathematics, Mysticism, Map Making, Masonry, 
                              Ceremonial Burial, Alphabet
    
         Ironclad          <- Steam Engine, Physics, Invention, Navigation, 
                              Engineering, Astronomy, Construction, Literacy, 
                              Mathematics, Mysticism, Currency, Code of Laws, 
                              Writing, Map Making, The Wheel, Masonry, 
                              Ceremonial Burial, Bronze Working, Alphabet
    
         Cannon            <- Metallurgy, Gunpowder, Invention, University, 
                              Engineering, Philosophy, Construction, Literacy, 
                              Mathematics, Mysticism, Currency, Iron Working, 
                              Code of Laws, Writing, The Wheel, Masonry, 
                              Ceremonial Burial, Bronze Working, Alphabet
    
         Rifleman          <- Conscription, Explosives, Gunpowder, Chemistry, 
                              Invention, University, Medicine, Engineering, 
                              Philosophy, Republic, Construction, Trade, Literacy, 
                              Mathematics, Mysticism, Currency, Iron Working, 
                              Code of Laws, Writing, The Wheel, Masonry, 
                              Ceremonial Burial, Bronze Working, Alphabet
    
         Transport         <- Industrialization, Railroad, Steam Engine, Physics, 
                              Invention, Banking, Navigation, Bridge Building, 
                              Engineering, Republic, Astronomy, Construction, 
                              Trade, Literacy, Mathematics, Mysticism, Currency, 
                              Iron Working, Code of Laws, Writing, Map Making, 
                              The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
         Battleship        <- Steel, Industrialization, Railroad, Metallurgy, 
                              Steam Engine, Gunpowder, Physics, Invention, 
                              University, Banking, Navigation, Bridge Building, 
                              Engineering, Philosophy, Republic, Astronomy, 
                              Construction, Trade, Literacy, Mathematics, 
                              Mysticism, Currency, Iron Working, Code of Laws, 
                              Writing, Map Making, The Wheel, Masonry, 
                              Ceremonial Burial, Bronze Working, Alphabet
    
         Cruiser           <- Combustion, Refining, Corporation, 
                              Industrialization, Railroad, Explosives, 
                              Steam Engine, Gunpowder, Chemistry, Physics, 
                              Invention, University, Medicine, Banking, 
                              Navigation, Bridge Building, Engineering, 
                              Philosophy, Republic, Astronomy, Construction, 
                              Trade, Literacy, Mathematics, Mysticism, Currency, 
                              Iron Working, Code of Laws, Writing, Map Making, 
                              The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
         Armor             <- Automobile, Combustion, Refining, Corporation, 
                              Steel, Industrialization, Railroad, Metallurgy, 
                              Explosives, Steam Engine, Gunpowder, Chemistry, 
                              Physics, Invention, University, Medicine, Banking, 
                              Navigation, Bridge Building, Engineering, 
                              Philosophy, Republic, Astronomy, Construction, 
                              Trade, Literacy, Mathematics, Mysticism, Currency, 
                              Iron Working, Code of Laws, Writing, Map Making, 
                              The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
         Fighter           <- Flight, Combustion, Refining, Corporation, 
                              Industrialization, Railroad, Explosives, 
                              Steam Engine, Gunpowder, Chemistry, Physics, 
                              Invention, University, Medicine, Banking, 
                              Navigation, Bridge Building, Engineering, 
                              Philosophy, Republic, Astronomy, Construction, 
                              Trade, Literacy, Mathematics, Mysticism, Currency, 
                              Iron Working, Code of Laws, Writing, Map Making, 
                              The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
         Submarine         <- Mass Production, Automobile, Combustion, Refining, 
                              Corporation, Steel, Industrialization, Railroad, 
                              Metallurgy, Explosives, Steam Engine, Gunpowder, 
                              Chemistry, Physics, Invention, University, Medicine, 
                              Banking, Navigation, Bridge Building, Engineering, 
                              Philosophy, Republic, Astronomy, Construction, 
                              Trade, Literacy, Mathematics, Mysticism, Currency, 
                              Iron Working, Code of Laws, Writing, Map Making, 
                              The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
         Bomber            <- Advanced Flight, Flight, Combustion, Refining, 
                              Corporation, Industrialization, Electricity, 
                              Railroad, Metallurgy, Explosives, Steam Engine, 
                              Magnetism, Gunpowder, Chemistry, Physics, Invention, 
                              University, Medicine, Banking, Navigation, 
                              Bridge Building, Engineering, Philosophy, Republic, 
                              Astronomy, Construction, Trade, Literacy, 
                              Mathematics, Mysticism, Currency, Iron Working, 
                              Code of Laws, Writing, Map Making, The Wheel, 
                              Masonry, Ceremonial Burial, Bronze Working, 
                              Alphabet
    
         Carrier           <- Advanced Flight, Flight, Combustion, Refining, 
                              Corporation, Industrialization, Electricity, 
                              Railroad, Metallurgy, Explosives, Steam Engine, 
                              Magnetism, Gunpowder, Chemistry, Physics, Invention, 
                              University, Medicine, Banking, Navigation, 
                              Bridge Building, Engineering, Philosophy, Republic, 
                              Astronomy, Construction, Trade, Literacy, 
                              Mathematics, Mysticism, Currency, Iron Working, 
                              Code of Laws, Writing, Map Making, The Wheel, 
                              Masonry, Ceremonial Burial, Bronze Working, 
                              Alphabet
    
         Mech Infantry     <- Labor Union, Mass Production, Automobile, 
                              Combustion, Refining, Communism, Corporation, Steel, 
                              Industrialization, Railroad, Metallurgy, Explosives, 
                              Steam Engine, Gunpowder, Chemistry, Physics, 
                              Invention, University, Medicine, Banking, 
                              Navigation, Bridge Building, Engineering, 
                              Philosophy, Republic, Astronomy, Construction, 
                              Trade, Literacy, Mathematics, Mysticism, Currency, 
                              Iron Working, Code of Laws, Writing, Map Making, 
                              The Wheel, Masonry, Ceremonial Burial, 
                              Bronze Working, Alphabet
    
         Nuclear Unit      <- Rocketry, Advanced Flight, Flight, Combustion, 
                              Refining, Corporation, Electronics, 
                              Industrialization, Electricity, Railroad, 
                              Metallurgy, Explosives, Steam Engine, Magnetism, 
                              Gunpowder, Chemistry, Physics, Invention, 
                              University, Medicine, Banking, Navigation, 
                              Bridge Building, Engineering, Philosophy, Republic, 
                              Astronomy, Construction, Trade, Literacy, 
                              Mathematics, Mysticism, Currency, Iron Working, 
                              Code of Laws, Writing, Map Making, The Wheel, 
                              Masonry, Ceremonial Burial, Bronze Working, 
                              Alphabet
    
         Artillery         <- Robotics, Plastic, Space Flight, Rocketry, 
                              Advanced Flight, Flight, Combustion, Refining, 
                              Computers, Corporation, Electronics, 
                              Industrialization, Electricity, Railroad, 
                              Metallurgy, Explosives, Steam Engine, Magnetism, 
                              Gunpowder, Chemistry, Physics, Invention, 
                              University, Medicine, Banking, Navigation, 
                              Bridge Building, Engineering, Philosophy, Republic, 
                              Astronomy, Construction, Trade, Literacy, 
                              Mathematics, Mysticism, Currency, Iron Working, 
                              Code of Laws, Writing, Map Making, The Wheel, 
                              Masonry, Ceremonial Burial, Bronze Working, 
                              Alphabet