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Citation Info 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. 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].. [JPEG]. Retrieved from https://geo.nyu.edu/catalog/d2d15fec-66b4-4896-bee8-b063d388d481