| W. Gilpin | 1861 | E. M. McCook | 1869 |
| J. Evans | 1862 | S. H. Elbert | 1873 |
| A. Cummings | 1865 | E. M. McCook | 1874 |
| A. C. Hunt | 1867 | J. L. Routt | 1875 |
State.
| J. L. Routt | Republican | 1876 |
| F. W. Pitkin | ” | 1879 |
| J. B. Grant | Democrat | 1883 |
| B. H. Eaton | Republican | 1885 |
| A. Adams | Democrat | 1887 |
| J. A. Cooper | Republican | 1890 |
| J. L. Routt | ” | 1891 |
| D. H. Waite | Populist | 1893 |
| A. W. M’Intire | Republican | 1895 |
| A. Adams | Dem.-Populist | 1897 |
| C. S. Thomas | ” | 1899 |
| J. B. Orman | ” | 1901 |
| J. H. Peabody | Republican | 1903 |
| A. Adams | Democrat | 1905[5] |
| Jesse F. M’Donald | Republican | 1905[5] |
| Henry A. Buchtel | ” | 1907 |
| John H. Shafroth | Democrat | 1909 |
Authorities.—For topography and general description: Hayden and assistants, reports on Colorado, U.S. Department of the Interior, Geological and Geographical Survey of the Territories (13 vols., 1867-1878), various reports, especially annual report for 1874; Captain J. C. Frémont, Report of the Exploring Expedition to the Rocky Mountains in 1842, published 1845 as Congressional document 28th Congress, 2nd Session, House Executive Document No. 166, and various other editions. Other early exploring reports are: The Expeditions of Zebulon Montgomery Pike ... Through Louisiana Territory and in New Spain in the Years 1805-6-7, edited by E. Coues (3 vols., New York, 1895); Account of an Expedition from Pittsburgh to the Rocky Mountains, 1819-20, under the Command of Major S. H. Long; compiled ... by Edwin James (3 vols., London; 2 vols., Philadelphia, 1823); Captain H. Stansbury, Exploration of the Valley of the Great Salt Lake (2 vols., Philadelphia, 1852; also as Senate Executive Document No. 3, 32nd Congress Special Session); Francis Parkman, The California and Oregon Trail (New York, 1849; revised ed., Boston, 1892),—a narrative of personal experience, as are the two following books: Bayard Taylor, Colorado; A Summer Trip (New York, 1867); Samuel Bowles, The Switzerland of America, A Summer Vacation in Colorado (Springfield, Mass., 1869); F. Fossett, Colorado; A Historical, Descriptive and Statistical Work on the Rocky Mountain Gold and Silver Region (Denver, 1878; New York, 1879, 2nd ed., 1880).
On fauna and flora: United States Biological Survey, Bulletins (especially No. 10), &c.; the Biennial Report of the State Game and Fish Commissioner; United States Geological Survey, 10th Annual Report, pt. v., and 20th A.R., pt. 5, and various publications of the United States Forestry Division for forest and forest reserves; Porter and Coulter, Synopsis of the Flora of Colorado (1879); and scattered papers in scientific periodicals. On climate: United States Department of Agriculture, Colorado Climate and Crop Service (monthly). On soil and agriculture: Annual Report of the State Board of Agriculture (since 1878), of the State Agricultural College, Agricultural Experiment Station (since 1887), and of the State Board of Horticulture; Biennial Report of the State Board of Land Commissioners (since 1879); publications of the United States Department of Agriculture, various bulletins on agrostology, water supply and irrigation, &c. (See Department bibliographies); United States Census, 1900 (States), Bulletin 177, “Agriculture in Colorado” (Special), Bulletin 16, “Irrigation in the United States” (1902), &c.; United States Geological Survey, various materials, consult bibliographies in its Bulletins 100, 177, 215, 301, &c. On manufactures: publications of United States Census, 1900, and the special census of manufactures, 1905. On mineral industries: United States Geological Survey, Annual Report, annual volume on “Mineral Resources”; also the annual Mineral Industry (Rothwell’s New York-London); Colorado State Bureau of Mines, Biennial Report, Inspector of Coal Mines, Biennial Report (since 1883-1884); and an enormous quantity of information in the publications of the United States Geological Survey. For labour troubles see below. On railways, see annual Statistics of Railways of the United States Interstate Commerce Commission, and Poor’s Manual (Annual, New York). Rivers, see Index to Reports of the Chief of Engineers, United States Army (3 vols., 1900, covering 1866-1900); publications United States Geological Survey. On population: United States Census, 1900. Administration: J. W. Mills’ Annotated Statutes of the State of Colorado ... (2 vols., Denver, 1891; vol. iii. 1896); Helen L. Sumner, Equal Suffrage in Colorado (New York, 1909,); J. E. Snook, Colorado History and Government (Denver, 1904), is a reliable school epitome.
On history: F. L. Paxson, “A Preliminary Bibliography of Colorado History,” being vol. iii., No. 3, of University of Colorado Studies (June 1906); H. H. Bancroft, History of ... Nevada, Colorado and Wyoming, 1540-1888 (San Francisco, 1890); on labour conditions and troubles consult: Reports of the State Bureau of Labour Statistics (since 1892); Annual Reports of the State Board of Arbitration (since 1898); publications of United States Bureau of Labour (bibliographies); also especially Senate Document 122, 58th Congress, 3rd Session, covering the years 1880-1904. See also [Cripple Creek] and [Leadville].
[1] The market value of silver varied in the years 1870-1885 from $1.32 to $1.065 an ounce; 1886-1893, $0.995 to $0.782; 1894-1904, $0.630 to $0.5722.
[2] The mineral yield for 1907, according to The Mineral Resources of the United States, 1907, amounted to $71,105,128.