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![Report of the Geological Exploration of the Fortieth Parallel, made by order of the Secretary of War according to acts of Congress of March 2, 1867, a [Hardcover]](/itemImage/2/2/2/1/2_6505819.jpg "Report of the Geological Exploration of the Fortieth Parallel, made by order of the Secretary of War according to acts of Congress of March 2, 1867, a [Hardcover]")