John K. Hillers 1873 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]
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)
