Allsman, Paul T. _Reconnaissance of Gold Mining Districts in the Black Hills, South Dakota._ U.S. Bureau of Mines, No. 427. Washington, D. C.: U.S. Dept. of Interior, 1940. Baldwin, G. P., editor. _The Black Hills Illustrated._ Philadelphia: Baldwin Syndicate, 1904. Carpenter, F. R. _The Mineral Resources of the Black Hills._ South Dakota School of Mines Preliminary Report, No. 1. Rapid City: South Dakota School of Mines, 1888. Casey, Robert J. _The Black Hills._ New York: Bobbs-Merrill Co., 1949. Dick, Everett. _Vanguards of the Frontier._ New York: D. Appleton-Century Co., 1941. Eloe, Frank. “Rushmore Cave,” _Black Hills Engineer_, XXIV (December, 1938), 274. Fenton, C. L. “South Dakota’s Badlands,” _Nature Magazine_, XXIV (August, 1941), 370-74. Glasscock, C. B. _The Big Bonanza._ Indianapolis: Bobbs-Merrill Co., 1931. Hans, Fred. _The Great Sioux Nation._ Chicago: Donahue, 1907. Hayden, F. V. and Meek, F. B. “Remarks on Geology of the Black Hills,” _Academy of Natural Science Proceedings._ Philadelphia: Academy of Natural Science, 1858, X, 41-59. Hough, Emerson. _The Passing of the Frontier._ New Haven: Yale University Press, 1921. Kingsbury, G. W. _History of Dakota Territory._ Chicago: The S. J. Clarke Co., 1915. Lake, Stuart. _Wyatt Earp._ Boston: Houghton Mifflin, 1931. Mirsky, Jeannette. _The Westward Crossings._ New York: Alfred A. Knopf, 1946. Newton, Henry. _Geology of the Black Hills._ Washington, D. C.: United States Geographical and Geological Survey, 1880. O’Harra, C. C. “The Gold Mining Industry of the Black Hills,” _Black Hills Engineer_, XIX (January, 1931), 3-9. ——. _The White River Badlands._ Department of Geology, No. 13. Rapid City: South Dakota School of Mines, 1920. Rothrach, E. P. _A Hydrologic Study of the White River Valley. South Dakota Geological Survey Report._ Vermillion, South Dakota: University of South Dakota, February, 1942. Todd, James Edward. _A Preliminary Report on the Geology of South Dakota._ South Dakota Geological Survey, No. 1. Vermillion: University of South Dakota, 1894. Tullis, E. L. “The Geology of the Black Hills,” _Black Hills Engineer_, XXV (April, 1939), 26-38. Footnotes [1]For an account of the history and natural wonders of Estes Park, readers are referred to a previous book in this series, _Estes Park: Resort in the Rockies_, by Edwin J. Foscue and Louis O. Quam. [2]A treasured manuscript journal kept by the author’s great-uncle, who was for many years curator of the Colorado State Historical Society’s museum in Denver, reports an interview with Calamity Jane some time before her death which convinced him that the facts were substantially as they are stated here.