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on mount, printed upper left: Explorations in Nevada and Arizona; upper right: Expedition of 1871.-Lieut. Geo.M.Wheeler. Com'd'g.; lower left: T.H. O'Sullivan.Phot.; lower right: No. 15; across bottom center: ICEBERG CAN?ON, COLORADO RIVER, LOOKING ABOVE. On verso, upper right in graphite: W1177


(Charles Isaacs Photographs, Malvern, Pennsylvania); NGA purchase, 2005.