Context

Context of Geologic structure and altitude of the top of the Minnelusa Formation, northern Black Hills, South Dakota and Wyoming, and Bear Lodge Mountains, Wyoming, 1985, Department of the Interior, United States Geological Survey ; by K.D. Peter, D.P. Kyllonen, and K.R. Mills ; prepared in cooperation with the South Dakota Department of Water and Natural Resources and the Black Hills Conservancy Subdistrict
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