#1: The "Up Colorado" running upstream a mile or two above Bridge Canyon (?) Crew: Al Ross, Engr, USBR; Les Pampel, Engr, USBR; Harry Aleson, pilot. Photo #2 is a short distance upstream from this photo
Papers of Otis R. Marston: Still images, 1870-1978. vols. 56-104, Colorado River and tributaries (Grand Canyon to Gulf of California) The Otis Marston Colorado River Collection
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