Jon E. Kalb, Assefa Mebrate, Doris Tischler, Fossil Elephantoids: From the Hominid-Bearing Awash Group, Middle Awash Valley, Afar Depression, Ethiopia, Transactions of the American Philosophical Society, Vol. 83, No. 1 (1993), pp. i-xv+1-114
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Kalb et al. (1993) studied this question.
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