| A.J. Russell Caves of the Mountains, Black Buttes [Union Pacific R.R. views, across the continent, west from Omaha.] 1868-1870 Stereoview Library of Congress, Prints and Photographs Division Reproduction Number: LC-DIG-stereo-1s00124 (digital file from original photo, front) LC-DIG-stereo-2s00124 (digital file from original photo, back) LC-USZ62-51979 (b&w film copy neg. of full stereo) LL/110115
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