| Title | Edition | Year of Publication | Contributors | Country of Publication | Possible Copyright Status | Available Online? |
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| American blue book <Boswell> | | 1922 | Harry James Boswell | |  | |  | |
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| "Around the circle" | | 1915 | Edwin L. (Edwin Legrand) Sabin | | | | | |
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| Blue hills | | 1930 | Edna Davis Romig | | | |  | |
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| The book of Colorado Springs | | 1934 | Manly Dayton Ormes, Mrs. Eleanor (Reddie) Ormes | | | | | |
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| Candles in the night | | 1936 | | | | | | |
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| Colorado in verse & picture | | 1928 | Laura S. Duvall | | | | | |
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| Colorado; its government and history | | 1934 | Lashley Grey. Harvey | | | | | |
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| Colorado mountain playgrounds | | 1925 | | | | | | |
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| The Colorado range cattle industry | | 1937 | Ora Brooks Peake | | | | | | 
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| Colorado's story | | 1930 | Frank Clarence Spencer | | | | | |
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| Colorado: short studies of its past and present | | 1927 | Junius Henderson, Colin Brummitt Goodykoontz, George Norlin | | | | | |
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| Colorado: the story of a western commonwealth | | 1933 | LeRoy R. (LeRoy Reuben) Hafen | | | | | |
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| Colorado | | 1932 | Arthur Hawthorne Carhart, Paul Bringle | | | | | |
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| Dangers of the trail in 1865: a narrative of actual events | | 1912 | Charles E. (Charles Edward) Young | | | | | |   
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| Evenings with Colorado poets | | 1926 | Frank Clarence Spencer, Francis Shanor Kinder | | | | | |
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| Experiments in Colorado colonization | | 1926 | Colin Brummitt Goodykoontz, James F. (James Field) Willard | | | | | |
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| A guidebook to Colorado | | 1911 | Eugene Parsons | | | | | |
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| History of agriculture in Colorado: a chronological record of progress in the development of general farming, livestock production and agricultural education and investigation, on the western border of the great plains and in the mountains of Colorado, 1858 to 1926 | | 1926 | Alvin T. (Alvin Theodore) Steinel, D. W. (Daniel Webster) Working | | | | | |
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| History of Colorado | | 1927 | James H. Baker, LeRoy R. (LeRoy Reuben) Hafen | | | | | |
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| History of the military organizations of the state of Colorado, 1860-1935 | | 1935 | John Henry Nankivell | | | | | |
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| The Indians of the Pike's Peak region: including an account of the battle of Sand Creek, and of occurrences in El Paso County, Colorado, during the war with the Cheyennes and Arapahoes, in 1864 and 1868 | | 1914 | Irving Howbert | | | | | |
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| The making of Colorado: a historical sketch | | 1908 | Eugene Parsons | | | | | |
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| Memories of a lifetime in the Pike's Peak region | | 1925 | Irving Howbert | | | | | |
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| The Rocky Mountain wonderland | | 1915 | Enos Abijah Mills | | | | | |
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| Semi-centennial history of the state of Colorado | | 1913 | Jerome C. (Jerome Constant) Smiley | | | | | |
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| The shining mountains, Colorado | | 1935 | Edgar Carlisle McMechen, Ina Teresa Aulis | | | | | |
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| The spell of the Rockies | | 1911 | Enos Abijah Mills | | | | | |
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| The story of Colorado: out where the West begins | | 1925 | Will Crawford, Arthur Chapman | | | |  | |
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| Under the turquoise sky of Colorado: in which is shown how pleasant, healthful and economical a sojourn in the ideal vacation-land may be | | 1907 | | | | | | |
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| Who's who in Colorado: a biographical record of Colorado's leaders in business, professional, and public life | | 1938 | | | | | | |
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| Wild life on the Rockies | | 1909 | Enos Abijah Mills | | | | | |
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| Zoology of Colorado | | 1927 | Theodore D. A. (Theodore Dru Alison) Cockerell | | | | | |
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Public Domain Books