A view of visitors boarding an elevator on "[the] Highway on crest of Boulder Dam, with elevator tower where visitors are conducted by guides to powerhouse." Boulder Dam was officially re-named Hoover Dam in 1947.
A colored postcard portraying an artist's rendering of a Hoover (Boulder) Dam interior. Printed on the top border of the card: "Entrance to one of the four 56 foot diversion tunnels, Boulder Dam Project." Handwritten text on back of card.