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John K. Hillers
[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. 190]
Library of Congress, Prints and Photographs Division
Reproduction Number: LC-DIG-stereo-1s00756 (digital file from original photo, front) LC-DIG-stereo-1s00756 (digital file from original photo, back) LC-USZ62-104700 (b&w film copy neg.)
John Wesley Powell's boat with chair attached, on the banks of the Colorado River.