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Heck H,. (1976). Die Erhaltung des Pzewalskipferdes. |
Clabby, J. (1976). The Natural History of the Horse. New York: Taplinger Publishing Company. |
Schaller, G. B.:. (1976). The Serengeti Lion: A Study of Predator-Prey Relations (Wildlife Behavior and Ecology series). Chicago: University Of Chicago Press. |