1. Paleocene flora of the Rocky Mountains and Great Plains Author/Creator: Brown, Roland W. 1893-1961. (Roland Wilbur) Publication/Creation: Washington : U.S. Govt. Print. Off, 1962 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 375-377. Access & Availability: Loading
2. Paleocene flora of the Rocky Mountains and Great Plains Author/Creator: Brown, Roland W. 1893-1961, (Roland Wilbur), author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1962 Resource Type: Book Access & Availability: Loading
3. Palynostratigraphy of the Tullock Member (lower Paleocene) of the Fort Union Formation in the Powder River Basin, Montana and Wyoming Author/Creator: Nichols, Douglas J. Publication/Creation: [Washington, D.C.] : U.S. G.P.O. ; Denver, CO : For sale by the Books and Open-File Reports Section, U.S. Geological Survey, 1992 Resource Type: Book Access & Availability: Loading