Rocky Mountain Fuel Company's Simpson Mine community in Boulder County, Colorado, 1913
MLA
Denver Public Library. Western History Department. "Rocky Mountain Fuel Company's Simpson Mine community in Boulder County, Colorado, 1913." Georgia State University. Special Collections. 1913, http://digitalcollections.library.gsu.edu/cdm/ref/collection/mhross/id/101443.
APA
Denver Public Library. Western History Department (1913). Rocky Mountain Fuel Company's Simpson Mine community in Boulder County, Colorado, 1913. Retrieved from http://digitalcollections.library.gsu.edu/cdm/ref/collection/mhross/id/101443
Chicago
Denver Public Library. Western History Department. "Rocky Mountain Fuel Company's Simpson Mine community in Boulder County, Colorado, 1913." 1913. April 26, 2026. http://digitalcollections.library.gsu.edu/cdm/ref/collection/mhross/id/101443.
