American Eocene didelphids. American Museum novitates ; no. 307

Simpson, George Gaylord, 1902-2005-10-062005-10-061928http://hdl.handle.net/2246/31687 p. : ill. ; 23 cm.Includes bibliographical references (p. [1]).1607605 bytesapplication/pdfen-USQL1 .A436 no.307, 1928Peratherium comstocki.Peratherium marsupium.Peratherium innominatum.Opossums, Fossil -- Wyoming.Marsupials, Fossil -- Wyoming.Mammals, Fossil -- Wyoming.Paleontology -- Eocene -- Wyoming.Paleontology -- Wyoming.Opossums -- Evolution -- North America.American Eocene didelphids. American Museum novitates ; no. 307text