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Glen Canyon. Sentinel Rock Mouth of Sentinel Creek. Glen Canyon between Crossing of the Father's NARA .tif Local identifier PS War Department Office of the Chief of Engineers Powell Survey ca NARAAuthor Beaman Elias Olcott Photographer File GlenCanyon SentinelRock MouthofSentinelCreek GlenCanyonbetweenCrossingoftheFather'sandPariaRiver