Map 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.
Relief 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."
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