William Bell,
1872, Marble Cañon, one of the gorges of the Colorado here, 1,200 feet deep., [U.S. War Dept., Corps of Engineers; Geographical Explorations and Surveys West of 100th Meridian, Expedition of 1872; Lieut. Geo. M. Wheeler, commanding.], Stereoview,
Library of Congress, Prints and Photographs Division,
LL/108288