Black and white image of Hoover Dam construction. A cat-walk is visible, spanning the canyon over the upstream cofferdam. The span is approximately between triangulation points C-7 and C-8. Elevation at the middle of the span is approximately 1,005 feet. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Black and white image of the downstream face of Hoover Dam and its power plant at night, as seen from the lower portal road at the dam. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Black and white image with the following printed description: Airplane motor propelled boat used in photographic survey of Colorado River between dam and Jumbo Wash.
Black and white image with the following printed description: Restored kiva or underground ceremonial chamber at Lost City (Pueblo Escondido), near St. Thomas, Nevada.