For additional information refer to, Stephens, H. G., Shoemaker, E. M., Shoemaker, E. M., & Shoemaker, E. M. (1987). In the footsteps of John Wesley Powell: An album of comparative photographs of the Green and Colorado Rivers, 1871-72 and 1968. Boulder, Colo: Johnson.
Note: Scanned from negative; also available in print.
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