| Timothy H. O'Sullivan Black Canon, Colorado River, Looking Below Near Camp [Wheeler Survey, Explorations and Surveys West of the 100th Meridian] 1871 Albumen print, on Wheeler Survey mount h: 8 x w: 10.8 in / h: 20.3 x w: 27.4 cm (photograph) 15.5 x 20 in (mount) Etherton Gallery LL/22191 Artist, Title, Date & USGS info printed on mount
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