Aspects of Evolution and Adaptation in American Black Bears (Ursus americanus Pallas) and Brown and Grizzly Bears (U. arctos Linné.) of North America

Stephen Herrero, Aspects of Evolution and Adaptation in American Black Bears (Ursus americanus Pallas) and Brown and Grizzly Bears (U. arctos Linné.) of North America, Bears: Their Biology and Management, Vol. 2, A Selection of Papers from the Second International Conference on Bear Research and Management, Calgary, Alberta, Canada, 6-9 November 1970. IUCN Publications New Series no. 23 (1972), pp. 221-231