0.48 L. L. Allen P. S. Bridges D. L. Evon K. R. Rosenberg M. D. Russell L. A. Schepartz V. J. Vitzthum M. H. Wolpoff, Demography and Human Origins, American Anthropologist, 1982.

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{ university press american pp }	0.10
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{ number data group table }	0.08