Report upon Geographical and Geological Explorations and Surveys west of the 100th Meridian, In charge of 1st Lieut. Geo. M. Wheeler, Corps of Engineers U. S. Army, under the direction of Brig. Gen. A. A. Humphreys
Engineer Department, United States Army. Published by Authority of Hon. Wm. W. Belknap, Secr. of War, in accordance with acts of Congress of June 23, 1874, & Febr. 15, 1875. In 7 Volumes, accompanied by one topographical and one geological Atlas