1. The occurrence of minor elements in ash of low-rank coal from Texas, Colorado, North Dakota and South Dakota Author/Creator: Deul, Maurice, author Publication/Creation: [Washington, D.C.] : United States Department of the Interior, Geological Survey, 1956 Resource Type: Book Access & Availability: Loading
2. Oil shale in Northwestern Colorado and adjacent areas Author/Creator: Winchester, Dean E. 1883-1936, (Dean Eddy), author Publication/Creation: [Washington, D.C.] : Department of the Interior, United States Geological Survey, 1916 Resource Type: Book Access & Availability: Loading
3. On hypersthene-andesite and on triclinic pyroxene in augitic rocks Author/Creator: Cross, Whitman, 1854-1949, author Publication/Creation: Washington, D.C. : Department of the Interior, United States Geological Survey, 1883 Resource Type: Book Access & Availability: Loading
4. Ore deposits in the vicinity of the London fault of Colorado Author/Creator: Singewald, Q. D. 1902-1987, (Quentin Dreyer), author Publication/Creation: [Washington, D.C.] : United States Department of the Interior, Geological Survey, 1941 Resource Type: Book Access & Availability: Loading
5. Ore deposits of the Kokomo-Tenmile District, Colorado Author/Creator: Bergendahl, M. H. 1921- (Maximilian Hilmar), author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1971 Resource Type: Book Access & Availability: Loading
6. Origin and microfossils of the oil shale of the Green River formation of Colorado and Utah Author/Creator: Bradley, Wilmot H. 1899-1979, (Wilmot Hyde), author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1931 Resource Type: Book Access & Availability: Loading
7. Origin of primary and diagenetic carbonates in the lacustrine Green River Formation (Eocene), Colorado and Utah Author/Creator: Pitman, Janet K. Publication/Creation: Denver, CO : For sale by U.S. Geological Survey, Information Services Resource Type: Book Access & Availability: Loading
8. Oxidized zinc deposits of the United States. Part 3, Colorado Author/Creator: Heyl, Allen V. 1918-2008. (Allen Van) Publication/Creation: Washington, D.C. : U.S. G.P.O., 1964 Resource Type: Book Is Part Of: U.S. Geological Survey bulletin, no. 1135. Access & Availability: Loading