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Keywords from Image Description:
Grand Canyon. The heaviest single drop on the river. feet according to Stone in . NARA .tif Local identifier PS War Department Office of the Chief of Engineers Powell Survey ca NARAAuthor Beaman Elias Olcott Photographer File GrandCanyon Theheaviestsingledropontheriver feetaccordingtoStonein feetbyearly NARA tif tif File