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David R,. (1966). Breeding the indian wild ass. Int Zoo Yearb, , 197–198.
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DENNISTON et al,. (1982). Wild horse study.
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Dietrich Wo,. (1941). Die Säugetierpaläontologischen Ergebnisse der Kohl-Lars'schen Expedition 1937-1939 im nördlichen Deutsch-Ostafrika. Zbl, , 217–223.
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Dietrich Wo,. (1959). Hemionus Pallas im Pleistozän von Berlin. Vertebrata Palasiatica, 3, 13–22.
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DIRSCHL HJ et al,. (1978). Preliminary results from an aereal census of livestock and wildlife of Kenya s rangelands.
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Dirschl Hj, W. S. (1978). Grevy's Zebra abundance and distribution in Kenya, 1977. Ministry Tourism and Wildl; Areal survey rep ser, 4.
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Dirschl Hj, W. S. (1978). Population indices and distribution of the Grevy's Zebra in Kenya, 1977. Aerial Survey Rep, 4.
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Dittrich L,. (1964). Mähnenlose Zebras im Zoo Hannover. Z Säugetierk, 29, 100–104.
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Dobroruka Lj,. (1961). Eine Verhaltensstudie des Przewalski- Urwildpferdes (Equus przewalskii Poliakiow 1881) in dem Zoologischen Garten Prag. Equus, 1, 89–104.
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DOBRORUKA LJ et al,. (1987). An analysis of the population of Grevy's zebra. Int Zoo Yb, 26, 290–293.
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