Portrait of a Geographic Survey Team in a Camp Near the Mount of the Holy Cross in Colorado Titled "Camp Study. Hayden, Stevenson, Holman, Jones, Gardner, Whitney and Holmes. The Party That Made the First Ascent of the Holy Cross Mountain" (1873)

Portrait of a geographic survey team in a camp near the Mount of the Holy Cross in Colorado titled "Camp study. Hayden, Stevenson, Holman, Jones, Gardner, Whitney and Holmes. The party that made the first ascent of the Holy Cross Mountain," 1873. By William Henry Jackson.

Source: National Archives and Records Administration.

Portrait of Five Members of a Survey Expedition Eating Around a Campfire (1870)

Portrait of five members of a survey expedition eating around a campfire, 1870. They are identified as (from left to right): James Stevenson, Charles Turnbull, Henry Elliot, Branson, and cook "Potato John." By William Henry Jackson. Animated stereoscopic photographs.

Source.