1. Stratigraphy and petrology of the Permian rocks of southwestern Montana, Author/Creator: Cressman, Earle Rupert, 1923- Publication/Creation: Washington : U.S. Govt. Print. Off, 1964 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 313 A-C. Access & Availability: Loading
2. Stratigraphic correlations for Montana and adjacent areas Author/Creator: Groff, Sidney Lavern, 1919- Publication/Creation: [Butte, Mont.] : Montana Bureau of Mines and Geology, 1963 Resource Type: Map Access & Availability: Loading