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Geographical and Geological Survey of the Rocky Mountain Region (U.S.). Jenney, Walter P. (Walter Proctor), 1849-1921. Mahlo, Emil, 1851-1904.. (1879). Map of the Black Hills of Dakota : from explorations made in 1875. [JPEG]. Dept. of the Interior, U.S.G. and G. Survey (Washington, D.C.). Retrieved from https://geodata.lib.berkeley.edu/catalog/p16022coll230:533