Donnell, John R., editor, 1960, GEOLOGICAL ROAD LOGS OF COLORADO. Rocky Mountain Association of Geologists, Denver. Itineraries for a number of geological trips along Colorado highways and byways.
Eckel, Edwin B., 1961, MINERALS OF COLORADO, A 100-YEAR RECORD. U. S. Geological Survey Bulletin 1114.
Emmons, S. F., Cross, Whitman, and Eldridge, G. H., 1896, GEOLOGY OF THE DENVER BASIN IN COLORADO. U. S. Geological Survey Monograph 27. The classic early treatment of the surface geology around Denver, with many historic illustrations.
Hansen, Wallace R., 1965, THE BLACK CANYON OF THE GUNNISON TODAY AND YESTERDAY. U. S. Geological Survey Bulletin 1191. A readable account of this unusual national monument near Montrose.
Hansen, Wallace R., 1969, THE GEOLOGIC STORY OF THE UINTA MOUNTAINS. U. S. Geological Survey Bulletin 1291. The eastern part of this range is in Colorado.
Henderson, C. W., 1926, MINING IN COLORADO, A HISTORY OF DISCOVERY, DEVELOPMENT AND PRODUCTION. U. S. Geological Survey Professional Paper 138.
Lee, W. T., 1917, THE GEOLOGIC STORY OF THE ROCKY MOUNTAIN NATIONAL PARK, COLORADO. U. S. National Park Service Publication. An old report, not adequately superseded.
Lovering, T. S., and Goddard, E. N., 1950, GEOLOGY AND ORE DEPOSITS OF THE FRONT RANGE, COLORADO. U. S. Geological Survey Professional Paper 223. A comprehensive study of mineral-bearing areas in the Front Range.
Lohman, S. W., 1965, THE GEOLOGIC STORY OF COLORADO NATIONAL MONUMENT. Colorado and Black Canyon Natural History Association, Grand Junction.
Pearl, Richard M., 1956, NATURE AS SCULPTOR: A GEOLOGIC INTERPRETATION OF COLORADO SCENERY. Denver Museum of Natural History Popular Series No. 6, Revised Edition.