1. Holocene alpine soils in gneissic cirque deposits, Colorado Front Range / by P.W. Birkeland, R.M. Burke, and R.R. Shroba. Birkeland, Peter W. [Reston, Va.] : Department of the Interior, U.S. Geological Survey, 1987.Washington : United States Government Printing Office. Book Online
2. Mineral resources of the Mount Zirkel Wilderness and northern Park Range vicinity, Jackson and Routt counties, Colorado / by George L. Snyder, Lowell L. Patten, Jeffrey J. Daniels. Snyder, George L. (George Leonard), 1927- [Reston, Va.] : Department of the Interior, U.S. Geological Survey, 1987.Washington : United States Government Printing Office. Book Online
3. Mineral resources of the Chama-southern San Juan Mountains wilderness study area, Mineral, Rio Grande, Archuleta, and Conejos Counties, Colorado / by U.S. Geological Survey and U.S. Bureau of Mines. [Reston, Va.] : United States Department of the Interior, Geological Survey, 1985.Washington : United States Government Printing Office. Book Online
4. Summary of the geology, economic aspects, and geochemistry of the Schwartzwalder uranium-bearing area, Ralston Buttes district, Jefferson County, Colorado / by E.J. Young. Young, Edward J. (Edward Joseph), 1923- [Reston, Va.] : Department of the Interior, U.S. Geological Survey, 1985.Washington : United States Government Printing Office. Book Online
5. New names for units in the lower part of the Green River Formation, Piceance Creek Basin, Colorado / by Ronald C. Johnson. Johnson, Ronald C. (Ronald Carl), 1950- [Reston, Va.] : United States Department of the Interior, Geological Survey, 1984.Washington : United States Government Printing Office. Book Online
6. Porvenir formation (new name)--and other revisions of nomenclature of Mississippian, Pennsylvanian, and lower Permian rocks, southeastern Sangre de Cristo Mountains, New Mexico / by Elmer H. Baltz and Donald A. Myers. Baltz, Elmer H. (Elmer Harold), 1927-2015 [Reston, Va.] : United States Department of the Interior, Geological Survey, 1984.Washington : United States Government Printing Office. Book Online
7. Precambrian deposits of zinc-copper-lead sulfides and zinc spinel (gahnite) in Colorado / by Douglas M. Sheridan and William H. Raymond. Sheridan, Douglas M., 1921- [Reston, Va.] : Department of the Interior, United States Geological Survey, 1984.Washington : United States Government Printing Office. Book Online
8. Las Animas Formation (upper Precambrian) in the subsurface of southeastern Colorado / by Ogden Tweto. Tweto, Ogden, 1912-1983 [Washington, D.C.] : U.S. Dept. of the Interior, U.S. Geological Survey, 1983. Book Online
9. Fluorine in a closed drainage basin, Saguache and Alamosa Counties, Colorado / by Ralph E. Van Alstine and Frederick O. Simon. Van Alstine, Ralph Erskine, 1914- [Reston, Va.] : United States Department of the Interior, Geological Survey, 1982.Washington : United States Government Printing Office. Book Online
10. The geologic story of Colorado National Monument / by S.W. Lohman ; graphics by Arthur L. Isom and John R. Stacy. Lohman, S. W. (Stanley William), 1907-1992 [Reston, Va.] : United States Department of the Interior, Geological Survey, 1981. Book Online
11. Geochemical variation in soils in the Piceance Creek basin, western Colorado : a geochemical baseline study of the composition of soils in a major oil-shale area / by Walter E. Dean, Charles D. Ringrose, and Ronald W. Klusman. Dean, Walter E. [Reston, Va.] : United States Department of the Interior, Geological Survey, 1979.Washington : United States Government Printing Office Book Online
12. Jasperoids of the Pando Area, Eagle County, Colorado / by T. G. Lovering and A. V. Heyl. Lovering, T. G. (Tom Gray), 1921-1996 [Reston, Va.] : United States Department of the Interior, Geological Survey, 1980.Washington : United States Government Printing Office Book Online
13. Mineral resources of the Indian Peaks study area, Boulder and Grand Counties, Colorado / by Robert C. Pearson, and by U.S. Bureau of Mines ; with a section on Interpretation of aeromagnetic data by Gordon Johnson. Pearson, Robert Carl, 1926- [Washington, D.C.] : United States Department of the Interior, Geological Survey, 1980.Washington : United States Government Printing Office Book Online
14. Relation of the carbon/oxygen ratio in coal to igneous intrusions in the Somerset coal field, Colorado : a study of the carbon-to-oxygen ratio in coals metamorphosed to higher than normal rank by igneous plutons / by John R. Dyni and David L. Gaskill. Dyni, John R. [Reston, Va.] : United States Department of the Interior, Geological Survey, 1980.Washington : United States Government Printing Office Book Online
15. Sapphirine in Precambrian rocks associated with stratabound sulfide deposits, Custer County, Colorado / by William H. Raymond, Peter A. Leiggi, and Douglas M. Sheridan. Raymond, William H. [Reston, Va.] : United States Department of the Interior, Geological Survey, 1980.Washington : United States Government Printing Office. Book Online
16. A study of the Cretaceous-Tertiary unconformity in the Piceance Creek Basin, Colorado : the underlying Ohio Creek Formation (Upper Cretaceous) redefined as a member of the Hunter Canyon or Mesaverde Formation / by Ronald C. Johnson and Fred May. Johnson, Ronald C. (Ronald Carl), 1950- [Reston, Va.] : United States Department of the Interior, Geological Survey, 1980.Washington : United States Government Printing Office Book Online
17. Geology and mineral deposits of the Needle Mountains district, southwestern Colorado / by L. J. Schmitt and W. H. Raymond. Schmitt, Leonard J. [Washington, D.C.] : United States Department of the Interior, Geological Survey, 1977.Washington : United States Government Printing Office. Book Online
18. Mineral resources of study areas contiguous to the Uncompahgre primitive area, San Juan Mountains, southwestern Colorado / by T.A. Steven [and four others]. Steven, Thomas A. (Thomas August), 1917-2013 [Washington, D.C.] : United States Department of the Interior, Geological Survey, 1977.Washington : United States Government Printing Office. Book Online
19. Mineral resources of the La Garita Wilderness, San Juan Mountains, southwestern Colorado / by Thomas A. Steven, and C. L. Bieniewski ; with section on Geophysical interpretation, by Gordon P. Eaton. Steven, Thomas A. (Thomas August), 1917-2013 [Washington, D.C.] : United States Department of the Interior, Geological Survey, 1977.Washington : United States Government Printing Office. Book Online
20. Nomenclature of Precambrian rocks in Colorado / by Ogden Tweto. Tweto, Ogden, 1912-1983 [Washington, D.C.] : United States Department of the Interior, Geological Survey, 1977.Washington : United States Government Printing Office. Book Online