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Potter Rl, H. R. (1979). Feral burro food habits and habitat relations, Grand Canyon National Park, Arizona. Symposium on the Ecology and Behavior of wild and feral Equids, Laramie, , 143–157.
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Prescott J,. (1981). Suckling behavior of Llama and Chapman's Zebra in captivity. Appl Anim Ethol, 7, 293–299.
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Quinn Jh,. (1957). Pleistocene Equidae of Texas. Bureau Economic Geol, , 31–32.
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Radulesco C, S. P. (1967). Sur la signification de certains equidés du Pléistocène inférieur et moyen de Roumanie. N Jb Geol Paläont Abh, 127, 157–178.
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Rashek Va,. (1964). Reproduction of Kulan, Equus hemionus onager Boddaert in Barsa Kelmes Island (Aral Sea). Vest Ceskos Spolec Zool, 26, 95.
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Rashek Va,. (1969). Some features of onager behaviour. Transactions Moskow Soc Natural, 35, 21–38.
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Rashek Va,. (1969). Some of features of onager behaviour. Tans Moscow Soc Nat, 35.
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Rashek Va,. (1973). Reproduction of the wild ass and its behavior during rutting time on the Barsa – Kelmes Island. Bjul Mosk Obsc Ispy Priroda Ot Biol, 78.
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Rashek Va,. (1976). Details of feeding and feeding behaviour in young wild asses on Barsa – Kelmes Island (Aralsea). Zool Zh, 55, 784–787.
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Rau Re,. (1974). Revised list of the preserved material of the extinct cape colony quagga, Equus quagga quagga. Ann S Afr Mus, 65, 41–87.
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