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By: Turnbull, William D. (William D.),Edition:Publication info: Chicago, Ill, Field Museum of Natural History, 1991Volume: n.s. no.21 (1991)Series:Holding Institution: Field Museum of Natural History LibrarySubjects: Eocene Hershkovitz, Philip Paleontology Protoptychus hatcheri Rodents, Fossil Washakie Formation WyomingBHL Collections: