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The Butte Mining District MontanaConference Proceeding Bookby Perry, Eugene S. (Eugene Sheridan), 1892-1968-
Published 1932 -
Report of the Geological exploration of the fortieth parallel made by order of the Secretary of War according to the acts of Congress of March 2 1867 and March 3 1869under the direction of A A Humphreys chief of engineersConference Proceeding BookPublished 1870