Arch in the Sky; South end of Cummings Mesa. It may have been a discovery on 1954, Sep. 25. It has previously been seen by thousands but only a close approach would reveal the opening back of it
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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