8:30 AM, in the side canyon at Mile 186.2, Cove Canyon. Side canyon on right bank at the head of Thirty Mile Damisite. LaRue places this 30.16 miles below the mouth of Green River which would be Mile 185.9
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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