| A.J. Russell Hermit's Grotto, Black Buttes [Union Pacific R.R. Stereoscopic Views. Across the Continent from West from Omaha. - No. 5. Bitter Creek Series] n.d. Stereocard National Museum of American History, Smithsonian Institution Id Number: 2012.3033.0138, Nonaccession Number: 2012.3033, Catalog Number: 2012.3033.0138 LL/107378
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