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1by Mills, Enos A., 1870-1922Subjects: “...Natural history West (U.S.) http://id.loc.gov/authorities/subjects/sh2010103464...”
Published 1994
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2by Petersen, David, 1946-Subjects: “...Natural history Rocky Mountains. http://id.loc.gov/authorities/subjects/sh2010103424...”
Published 1997
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