| William Bell Grand Caņon of the Colorado [U.S. War Dept., Corps of Engineers; Geographical Explorations and Surveys West of 100th Meridian, Expedition of 1872; Lieut. Geo. M. Wheeler, commanding. / Geological Series.] 1872 Stereoview Library of Congress, Prints and Photographs Division Reproduction Number: LC-DIG-stereo-1s01788 (digital file from original) LL/108300
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