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.
Blasting rock at noon-time, everyday, to put anchors in place. Note cameraman in foreground. Note on back: ""Photo by 'Six Companies' photographer named Frank."" - W. A. Davis, 1992