Route believed by Harvey Butchart to be the one used by Stanton-Hislop-Kane on 1890, Feb. 10, in climbing to the Tonto en route to the shoulder of the Tower of Ra
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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