by Marcos Tancredi 10 years ago
296
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THE REPUBLIC
TRADE
BRIDGE BUILDING
IRON WORKING
WARRIOR CODE
STEAM ENGINE
INVENTION
ENGINEERING
CONSTRUCTION
CURRENCY
BRONZE WORKING
THE WHEEL
HORSEBACK RIDING
PHYSICS
NAVIGATION
ASTRONOMY
MATHEMATICS
MASONRY
SEAFARING
POTTERY
MAP MAKING
ALPHABET
CODE OF LAWS
WRITING
CEREMONIAL BURIAL