Black and white photographic image of the visitors' gallery inside Hoover Dam's power plant. Written on the front of the postcard: "Visitors gallery, power plant, Boulder Dam."
An image of Rotary Club members having lunch at Boulder Dam while an unidentified man gives a speech. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
The Six Companies, Inc. Hoover Dam Photograph Collection (1931-1935), consists of approximately 400 black-and-white photographic prints contained in two photograph albums and an additional twenty-one loose black-and-white photographic prints with ten corresponding photographic negatives.
Black and white image of two men standing in front of penstock tunnel piping at the site of Hoover Dam construction. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
From the Morgan Sweeney Photograph Collection (PH-00228). The stone monument reads, "A Modern Civil Engineering Wonder of the United States - One of Seven Selected by the Ameircan Society of Civil Engineers, 1955. Nevada-Arizona."
An image of the downstream face of Hoover Dam in Black Canyon, showing diversion tunnel portals in the foreground. Note: Boulder Dam was officially renamed Hoover Dam in 1947.