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Scope/Content: Approaching the south wall of Black Canyon on the Colorado River. Technique: Scanned using a Sinar x view camera with Schneider APO-Componon 150mm lens and Better Light Super 8K-2 digital scanning camera insert, 8-bit RGB at 800 ppi.
Colorado River (Colo.-Mexico) Water resources development River surveys Boulder Canyon Project (U.S.)
Colorado River (Colo.-Mexico) Black Canyon (Ariz. and Nev.)