Background to evolution in Africa : [Systematic Investigation of the African Later Tertiary and Quaternary; proceedings of the symposium held at Burg Wartenstein, Austria, July - August, 1965, under the auspices of the Wenner-Gren Foundation for Anthropological Research, New York] - Bishop, Walter William; Clark, J. Desmond (John Desmond), 1916-2002 (University of Chicago Press, 1981)