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.

William Henry Holmes Hayden exploration Survey of 1873 – Crested Butte, Colorado Sketch showing Gothic Mountain and the East River Valley View up East River, Plate XVII. from USGS report 1874

William Henry Jackson Hayden exploration Survey of 1873 photograph JWH01638 showing men in camp. Views Among the Rocky Mountains of Colorado, Camp Scene, Holmes and Chittenden, Rolling up Bedding, 1874. from USGS

William Henry Jackson Hayden exploration Survey of 1873 photograph JWH01291 showing William Henry Holmes in camp with his sketchbook Writing Letters WH Holmes, Rocky Mountains Colorado, 1874. from USGS

William Henry Jackson Hayden exploration Survey of 1873 photograph JWH00490 Shows Hayden Survey men at camp dining table. This party made the first ascent of Mt. of the Holy Cross. Camp Study Hayden Stevenson Holman Jones Gardner Whitney and Holmes. from Read More

William Henry Jackson Upper Twin Lake photograph Lake County, Colorado 1873 Image was taken before the expedition crossed Red Mountain Pass into Taylor Park

William Henry Holmes View of Upper Twin Lake pencil on paper Colorado, 1873 Courtesy of the US Geological Survey, Department of the Interior/USGS, US Geological Survey, Drawing by William Henry Holmes.

William Henry Holmes Panoramic View of upper and lower Twin Lakes pencil on paper Colorado, 1873 Courtesy of the US Geological Survey, Department of the Interior/USGS, US Geological Survey, Drawing by William Henry Holmes.

William Henry Holmes Panoramic View of upper and lower Twin Lakes pencil on paper Colorado, 1873 Courtesy of the US Geological Survey, Department of the Interior/USGS, US Geological Survey, Drawing by William Henry Holmes.  

William Henry Jackson Utes at the Los Pinos agency photo taken between 1869-1870 Courtesy of USGS

Karl Wimar Cochetopa Pass mural 1862 Mural in the rotunda of the courthouse in St. Louis MO, depicting expected transcontinental route through the Rocky Mountains. Buffalos in the Cochetopa Pass of the Rocky Mountains, Old Federal Courthouse, St. Louis, MO