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1925. 2013-03-14T18:43:05Z. 2020-09-10T21:01:27Z. Darton, Nelson Horatio, 1865-1948. U.S. Geological Survey. English. Public. Black Hills (S.D. and Wyo.).

8. Geologic map of the Black Hills

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1970. 2018-05-14T18:43:09Z. 2021-09-27T17:12:10Z. South Dakota Geological Survey. South Dakota Geological Survey. English. cartographic image. Public. Black Hills (S.D. and Wyo.), United States, and Black Hills.