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3. Small arctoid and feliform carnivorans;Baskin,1996
4. A revised Paleogene geochronology and chronostratigraphy;Berggren;SEPM Spec. Publ.,1995
5. Geology and mammalian paleontology of the Sand Creek facies, Lower Willwood Formation (Lower Eocene), Washakie County, Wyoming;Bown;Mem. Geol. Surv. Wyo.,1979