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By: Emry, Robert J. - Thorington, Richard W. - Smithsonian InstitutionEdition:Publication info: Washington, Smithsonian Institution, 1982Volume: no.47 (1982)Series:Holding Institution: Smithsonian Libraries and ArchivesSubjects: Protosciurus Sciuridae, FossilBHL Collections: Unearthed! Smithsonian Libraries' Paleo Collection