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| Douglass, E.M., 1979. Hemolytic anemia in two black rhinos. Proceedings of the American Association of Zoo Veterinarians 1979: 116-117
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| Douglass, E., 1908. Rhinoceroses from the Oligocene and Miocene deposits of North Dakota and Montana. Annals of Carnegie Museum IV (3-4): 256-266, 7 figs, 6 tabs, Pls LXIII-LXIV.
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