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. delineator or engraver].
Dahl, James, former owner, Geographical Surveys West of the 100th Meridian (U.S.), Hamel, P. W., topographer, Humphreys, A. A. (Andrew Atkinson), 1810-1883, Nell, Louis, topographer, Wheeler, George M. (George Montague), 1842-1905 · 1878 Full Details
Georeferenced: false