Black and white aerial view of Black Canyon at Hoover Dam construction site. There are four visible bridges going over the Colorado River. Note: Boulder Dam was officially 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.
An artist's rendering of Hoover Dam. Printed text on front of card: "Hoover Dam, as it will look when completed, Boulder Canyon, Colorado River, near Las Vegas, Nevada."