37 x 49 cm. Relief shown by hachures and spot heights. "Atlas sheet no. 61(C)." "Expeditions of 1874 & 1875 under the command of 1st. Lieut. Geo. M. Wheeler, Corps of Engineers, U.S. Army." "Louis Nell, del." "By order of the honorable the Secretary of War." "Under the direction of Brig. General A. A. Hunphreys, Chief of Engineers, U. S. Army." Original publisher: U.S. Geographical Surveys West of the 100th Meridian, Scale: 1 inch to 2 miles or 1: 126720.