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5Economic geology of Gilpin county and adjacent parts of Clear Creek and Boulder counties, Colorado /by Bastin, Edson S. (Edson Sunderland), 1878-1953, Hill, James M. (James Madison), 1884-
Published 1917Government Document Book -
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7by Schrader, Frank C. (Frank Charles), 1860-1944Get full text
Published 1915
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