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John K. Hillers
The Gate of Lodore [Views on green River: Caņon of Lodore Series.]
[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. 242]
Library of Congress, Prints and Photographs Division
Reproduction Number: LC-DIG-stereo-1s01652 (digital file from original photo, front) LC-DIG-stereo-2s01652 (digital file from original photo, back)
Writing on the back; James C. Pilling.