Photo of a Scattered Group of Bison Bones Taken in a Field Somewhere in Colorado Territory (1870)

Photo of a scattered group of buffalo bones taken somewhere in Colorado Territory, c. 1870. Taken by photographer William Henry Jackson and created using a scan of the original glass negative.

Source: National Archives and Records Administration.

Photo of Gold Miners Posing in Their Camp in La Plata County, Colorado Territory (1874)

Photo of gold miners posing in their camp in La Plata County, Colorado Territory, 1874. Taken by photographer William Henry Jackson while he was a member of the Hayden Survey.

Source: National Archives and Records Administration.

Animated Stereoview Portrait of a US Army Soldier and His Family at Fort Garland, Colorado Territory (1874)

Animated stereoview portrait of a US Army soldier and his family at Fort Garland, Colorado Territory, 1874. By Timothy O'Sullivan.

Source: Library of Congress.

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.