An image of an interior view of the Hoover Dam powerhouse under construction. Caption on bottom of image reads: "Interior of power house. Boulder Dam. Nevada." Boulder Dam was renamed Hoover Dam in 1947.
An image showing a bird's eye view of Hoover Dam from the Arizona side, featuring intake towers. Boulder Dam was officially renamed Hoover Dam in 1947.
Black and White photographic postcard showing construction workers, cranes, and cement forms on Hoover (Boulder) Dam. Text on front of postcard: "Boulder Dam- Jan. 1934."