Equus onager
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James H. Honacki, Kenneth E. Kinman & James W. Koeppl, 1982, Order Perissodactyla, Mammal Species of the World (1 st Edition), Lawrence, Kansas, USA: Alien Press, Inc. & The Association of Systematics Collections, pp. 308-311
: 309
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309 |
Equus hemionus subsp. onager
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Wilson, Don E. & Reeder, DeeAnn, 2005, Order Perissodactyla, Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 1, Baltimore: The Johns Hopkins University Press, pp. 629-636
: 632
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632 |
Equus onager
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Peter Grubb, 1993, Order Perissodactyla, Mammal Species of the World (2 nd Edition), Washington and London: Smithsonian Institution Press, pp. 369-372
: 370
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370 |