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The major part of the papers consists of reports and maps on the holdings of the Rochester Mines Company in Humboldt County, Nevada (1916-1917). During this period Knopf was on the staff of the U.S. Geological Survey. Also a small amount of professional correspondence and lecture notes, chiefly relating to his career as a professor of geology at Yale University. Eleven of the letters are from Charles Schuchert, a colleague in the department.