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By: Emry, Robert J.Edition:Publication info: Washington, Smithsonian Institution Press; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.], 1973Volume: no.18 (1973)Series:Holding Institution: Smithsonian Libraries and ArchivesSubjects: Geology Geology, Stratigraphic Natrona Co Oligocene Vertebrates, Fossil WyomingBHL Collections: Unearthed! Smithsonian Libraries' Paleo Collection