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Klingel H,. (1969). The social organization and population ecology of the Plains Zebra (Equus quagga). Zoologica Africana, 4, 249–263.
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Klingel H,. (1969). Zur Soziologie der Grevy. Zoolog Anzeiger Suppl, 33, 311–316.
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Klingel H,. (1969). Dauerhafte Sozialverbände beim Bergzebra. Z. Tierpsychol., 26, 965–966.
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Ödberg Fo,. (1969). Bijdrage tot de Studie der Gedragenen van het paard (E. caballus L.).
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Oelofse J,. (1969). Plastic for game catching. Oryx, 10, 306–308.
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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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Robertshaw D, T. C. (1969). Sweat gland function of the donkey. J Physiol, 205, 79–89.
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ROPIHA RT et al,. (1969). The duration of pregnancy in thoroughbred mares. Vet Rec, 84, 552–555.
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Roth Hh,. (1969). Über das Schwimmen afrikanischer Landsäugetiere im Kariba – Stauseegebiet und ihr Verhalten gegenüber dem Flutwasser. Zool. Garten., 37, 12–29.
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