1. Fossil plants from the Colgate member of the Fox Hills sandstone and adjacent strata Author/Creator: Brown, Roland W. 1893-1961. (Roland Wilbur) Publication/Creation: Washington : Govt. Print. Off, 1939 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 189 A-I. Access & Availability: Loading
2. Fresh-water mollusks of Cretaceous Age from Montana and Wyoming Author/Creator: Yen, Teng-Chien Publication/Creation: Washington : U.S. Govt. Print. Off, 1951 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 233 A-E. Access & Availability: Loading