| John K. Hillers Distant view of an ancient moraine [Summit Valley] [U.S. topographical and geological survey of the valley of the Colorado River of the west, by J.W. Powell and A.H. Thompson. No. 129] 1875 Stereoview Library of Congress, Prints and Photographs Division Reproduction Number: LC-DIG-stereo-1s00871 (digital file from original photo, front) LC-DIG-stereo-2s00871 (digital file from original photo, back) LL/109151
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