d25vtythmttl3o.cloudfront.net...Kurtén, B., and E. Anderson 1980 Pleistocene Mammals of North...
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d25vtythmttl3o.cloudfront.net...Kurtén, B., and E. Anderson 1980 Pleistocene Mammals of North America. Columbiá University Press, New York. Lister, A. M. 1996 Evolution and Taxonomy