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Topographical Atlas projected to illustrated United State Geographical Surveys West of 100th. Meridian of longitude prospected in accordance with acts of Congress under the authority of the Honorable the Secretary of War, and the direction of Brg. Gen. A. A. Humphreys, Chief of Engineers U.S. Army embracing results of the different expeditions under the command of 1th. Lieut. Geo. M. Wheeler, Corps of Engineers