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Cranial and bacular variation in populations of spiny rats of the genus Proechimys (Rodentia: Echimyidae) from South America.

By Martin, Robert Eugene, 1944-. Washington, Smithsonian Institution Press; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.] 1970

By Martin, Robert Eugene, 1944-. Washington, Smithsonian Institution Press; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.] 1970