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Abstract Records include Board of Directors' minutes, 1861-1874; by-laws; agreements; deeds; reports of mining operations, 1887-1894; and letters, 1875-1877.
Abstract Report includes sections on a resume of U.S.G.S. monograph III on the geology of the Comstock, rock formations at various levels in the mines, and summary with reference to points of economic interest. Created by Henry R. Putnam, mining engineer who became a consultant, in 1912.