Plaque placed by The Dusty Dozen at Separation Canyon, about 1934, Aug. 03. It was removed 1939, Aug. and a larger plaque placed there by Julius Stone and party. The plaque was replaced at Separation Rapid near the new plaque 1971, Nov. 27
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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