1980. 2002-06-01T04:00:00Z. 2022-11-16T20:30:51Z. Geological Survey (U.S.). The Survey. English. cartographic image. Public. Montana, Big Horn County, Powder River County, Wyoming, Sheridan County, Big Horn County (Mont.), Powder River County (Mont.), and Sheridan County (Wyo.).
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1980. 2002-06-01T04:00:00Z. 2022-11-16T20:31:39Z. Geological Survey (U.S.). The Survey. English. cartographic image. Public. Montana, Powder River County, Wyoming, Sheridan County, Powder River County (Mont.), and Sheridan County (Wyo.).