Title from item.; On item: War Department, Corps of Engineers, U.S.A. Geographical Explorations and Surveys West of the 100th Meridian. Expedition of 1871. 1st. Lieut. Geo. M. Wheeler, Corps of Engineers, Commanding.; Plate number: No. 7; Mountain transportation. Pack mule, Pack and Packers.

Photograph by O'Sullivan, Timothy H., 1840-1882