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Grand Canyon of the Colorado River at the foot of the Toroweap Arizona. G.S.A. No. Grand Canyon NARA .tif Local identifier PS War Department Office of the Chief of Engineers Powell Survey ca NARAAuthor Beaman Elias Olcott Photographer File GrandCanyonoftheColoradoRiveratthefootoftheToroweap Arizona No GrandCanyonNationalPark