Head of Serpentine Rapid. J. Hall and C. Yost on the fan. Preliminary gauge: 12,500 cfs. The pegmatite at center appears in Butchart photo of 1957, Apr. 20 near the right margin; in Reilly #1 of 1962, Nov. 04
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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