William Henry Holmes Colorado 1873 sketch of Maroon Mountain

William Henry Holmes South Park, Colorado 1873 sketch at South Park

William Henry Holmes Colorado 1873 sketch of the Saugauche range

William Henry Jackson Colorado 1873 photograph of Red Rocks Falls  

William Henry Jackson Colorado 1873 photograph of the west side of the Saugauche range as seen from Red Mountain Pass from USGS

William Henry Jackson Clear Creek, Denver, Colorado 1873 photograph showing the Rendezvous Camp at Clear Creek where survey members collected and organized equipment for the seasons expeditions. Rendezvous Camp on Clear Creek, Four miles Northwest of Denver, Jefferson County. From Read More

William Henry Jackson Clear Creek, Denver, Colorado 1873 photograph showing the Rendezvous Camp at Clear Creek where survey members collected and organized equipment for the seasons expeditions. Rendezvous Camp on Clear Creek, Four miles Northwest of Denver, Jefferson County. From Read More

William Henry Jackson Crested Butte, Colorado photograph showing Teocalli Mountain From USGS report of 1874

William Henry Jackson Crested Butte, Colorado 1873 photograph of Teocalli Mountain from USGS

Hayden exploration Survey of 1873 USGS Hayden Survey Book from HACB

H.H.N. Hayden exploration Survey of 1873 – Crested Butte, Colorado sketch of the summit of Italian Mountain Italian Mountain. From USGS report 1874

William Henry Holmes Hayden exploration Survey of 1873 – Crested Butte, Colorado sketch of the view from Italian Mountain View from Italian Mountain, June 1st 1885. From USGS report 1874.