Archaeology. Unraveling khipu's secrets.
Mann
Charles C
CC
D000066:Accounting / Q000266:history; D003142:Communication / Q000266:history*; D003201:Computers; D049690:History, Ancient; D006801:Humans; D007199:Indians, South American / Q000266:history*; D008433:Mathematics / Q000266:history; D010568:Peru; D014956:Writing / Q000266:history*