Census

U.S. Census for Colorado 1870, 1880, 1900, 1910, 1920, 1930 (microfilm) Census indexes for Colorado 1860, 1870, 1880 Colorado State Census 1885 (microfilm) Alphabetical abstract for some counties 1885 census (microfilm) Index for Arapahoe County 1885 Census

Directories

Colorado State Business Directories
City Directories

Newspapers

Colorado newspapers

Biographical Reference Files

Name index (C.W.A. biographical reference file)
Biography Vertical files
C.W.A. births, deaths, marriages (a small, incomplete file)

Other Resources

Library catalog
Manuscript collection index
C.W.A. Pioneer interviews
Dawson Scrapbook index
The Colorado Magazine index
Sons of Colorado and Trail index
Colorado Genealogist

Bromwell's Colorado Portrait and Biography Index, McGrath's Real Pioneers of Colorado, Officials of Denver and Colorado 1858-1933, Colorado Families: A Territorial Heritage, Who's Who in Colorado and other biographical publications.