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2. Blackhawk
1906. 2011-12-12T21:24:23Z. 2022-03-29T20:39:05Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Colorado.
1906. 2019-02-25T20:51:16Z. 2019-04-23T16:20:48Z. Geological Survey (U.S.), cartographer. The Survey. English. cartographic image. Public. Colorado, Central City, Central City (Colo.), and Central City.
1906. 2021-07-29T17:40:22Z. 2021-07-29T17:40:22Z. Geological Survey (U.S.). The Survey. English. cartographic image. Public. Idaho Springs (Colo.), Clear Creek County (Colo.), Colorado, Clear Creek County, Clear Creek County., and Idaho Springs.
1906. 2017-05-22T20:19:57Z. 2017-06-06T21:07:58Z. Sanborn Map Company. Sanborn Map Co. English. cartographic image. Public. Colorado, Florence, Florence (Colo.), and Florence.
1906. 2013-03-14T14:54:32Z. 2013-03-14T14:54:32Z. Fisher, Cassius A. (Cassius Asa), 1872-1930. The Survey. English. Public. Colorado, Pueblo County, Otero County, and États-Unis.