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Systematics and Evolution of the Genus Esthonyx (Mammalia, Tillodontia) in the Early Eocene of North America

Philip D. GingerichGregg F. Gunnell

出版	Museum of Paleontology, University of Michigan, 1979
URL	http://books.google.com.hk/books?id=XLTIGAAACAAJ&hl=&source=gbs_api