1. Bishop, L. C. 1994. 429 Pigs and the ancestors: hominids, suids and environments during the Plio-Pleistocene of East Africa. Ph.D. thesis, Yale University, Ann Arbor, MI, University Microforms International
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3. Isotopic Biogeochemistry ( 13 C, 18 O) of Mammalian Enamel from African Pleistocene Hominid Sites