An image of airplanes flying over Boulder Dam and spelling the word "NAVY" for the dam's decennial. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Black and white image of Hoover Dam's crest and intake towers as seen from the Nevada upstream side. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
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.