The horse and its relatives Lydekker, Richard, 1849-1915 creator text book London G. Allen & Co 1912 1912
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ENG Horses Mules Zebras QL737.U62 L93 1912 https://www.biodiversitylibrary.org/bibliography/29477 2576427 agr12001367 10.5962/bhl.title.29477 Library, U.S. Dept. of Agriculture