Topographical sketch showing observatory site and surroundings at Ogden, Utah. Surveyed 1877. Prepared under the direction of 1st Lt. Geo. M. Wheeler, Corps of Engs., U.S. Army. Surveyed by Thompson & Weyss. Weyss & Lang del. The Graphic Co., N.Y. U.S. Geographical Surveys West of the 100th Meridian. By order of the honorable the Secretary of War, under the direction of Brig. Gen. A.A. Humphreys, Chief of Engineers U.S. Army. (1877)