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Acknowledgements

This project was made possible by generous funding from the G Harold & Leila Y. Mathers Foundation and The George Washington University's Selective Excellence Program to Bernard Wood and Adam D. Gordon. Special thanks to the Trustees of the Powell-Cotton Museum and to Malcolm Harman for granting ADG generous access to the chimpanzee and gorilla specimens and records under their care, and to Fred Spoor for supplying spreadsheet versions of the data in the Koobi Fora hominid crania monograph.