| John K. Hillers The canyon seen from the foot of Toroweep Valley, Grand Canyon [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. 220] 1873 Stereoview Library of Congress, Prints and Photographs Division Reproduction Number: LC-DIG-stereo-1s00819 (digital file from original photo, front) LC-DIG-stereo-2s00819 (digital file from original photo, back) LC-USZ62-94335 (b&w film copy neg. of left half stereo) LC-USZ62-127656 (b&w film copy neg.of full stereo) LL/109205
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