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1Subjects: “...Mines and mineral resources Colorado Boulder County....”
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2by Pearson, Robert Carl, 1926-Subjects: “...Mines and mineral resources Colorado Boulder County....”
Published 1980
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3Economic 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-Subjects: “...Mines and mineral resources Colorado Boulder County....”
Published 1917
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4Economic 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-Subjects: “...Mines and mineral resources Colorado Boulder County....”
Published 1917
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5by Neuerburg, George J.Subjects: “...Mines and mineral resources Colorado Boulder County Maps....”
Published 1967
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6by Goddard, Edwin N. (Edwin Newell), 1904-1997, Lovering, T. S. (Thomas Seward), 1896-1991Subjects: “...Mines and mineral resources Colorado Boulder County....”
Published 1942
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7by Moore, Frank B. (Frank Baker), 1912-, Cavender, Wayne S. (Wayne Sherrill), Kaiser, Edward Peck, 1912-Subjects: “...Mines and mineral resources. fast (OCoLC)fst01022541...”
Published 1957
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8Subjects: “...Mines and mineral resources Colorado Boulder County....”
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