John F. Hoffman's effort to photograph a D. Julien inscription on the east side of a boulder at Mile 212 1/2, left bank, 1/4 mile from the river and 600 ft. above it. Discovery is credited to Mark Lindquist of Portland
Papers of Otis R. Marston: Still images, 1870-1978. vols. 1-40, Colorado River and tributaries (Headwaters to Lee's Ferry) The Otis Marston Colorado River Collection
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