Dahl, James, former ownerGeographical Surveys West of the 100th Meridian (U.S.)Hamel, P. W., topographerHumphreys, A. A. (Andrew Atkinson), 1810-1883Nell, Louis, topographerWheeler, George M. (George Montague), 1842-1905Relief shown by hachures and spot heights. Prime meridian: Washington. Shows exploration routes, state borders. At lower left: "Issued Feb. 4th, 1878." "By order of the honorable, the Secretary of War, under the direction of Brig. Gen. A.A. Humphreys, Chief of Engineers, U.S. Army." Includes table of "dates of camps of river party in 1871." 1 map: 37 x 45 cm.JPEGd2d15fec-66b4-4896-bee8-b063d388d481engPublicMap showing routes of the river and land parties engaged in exploring the Grand Cañon of the Colorado; under the command of 1st. Lieut. Geo. M. Wheeler, Corps of Engineers, U.S. Army; P.W. Hamel and L. Nell, Topographers; Weyss, Thompson & Lang del. [i.e. delineator or engraver].MapsArizona--Grand Canyon National Park1878University of Michigan