 | Ryder, O.A., 1986. Species conservation and systematics: the dilemma of subspecies. Tree 1 (1), 9-10
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| George, M.; Puentes, L.A.; Ryder, O.A., 1983. Genetische Unterschiede zwischen den Unterarten des Breitmaulnashorns: pp. 60-67, figs. 1-3, table 1
 | In: Kloes, H.G. et al. International studbook for the African rhinoceroses, 31.12.1982, No. 2. Berlin, Zoologischer Garten: pp. 1-205, pls. 1-4 |
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| Ryder, O.A., 1981. (White) rhinos to China. Zoonooz (San Diego) 54 (1) Jan: 10-12, 5 images
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