Map, river and land parties, exploring Grand Canon of the Colorado.

Map showing routes of the river and land parties engaged in exploring the Grand Canon of the Colorado. Under the command of 1st. Lieut. Geo. M. Wheeler, Corps of Engineers, U.S. Army. 1871. P.W. Hamel and L. Nell, topographers. Issued Feb. 4th 1878. The Graphic Co. Photo-Lith., 30 & 41 Park Place, N.Y. Weyss, Thompson & Lang del. By order of the Honorable the Secretary of War. Under the direction of Brig. Gen. A.A. Humphreys, Chief of Engineers, U.S. Army. (in upper margin:) United States Geographical Surveys West of the 100th Meridian. (1889)

Wheeler, G.M.

1889

1875

U.S.

1:380 160

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