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By: Clark, John, - Guensburg, Thomas EdgarEdition:Publication info: [Chicago], Field Museum of Natural History, 1970Volume: v.16:no.16 (1970)Series:Holding Institution: University Library, University of Illinois Urbana ChampaignSubjects: Leptomeryx Mammal populations Nebraska Oligocene Paleontology Pennington County Sioux County South DakotaBHL Collections: