Postcard with an illustration of Colorado River looking upstream between mountains. The typed caption reads: "Colorado River, looking upstream, Boulder Damsite in 1931."
Postcard with an illustration of men working by the entrance a diversion tunnel. The caption reads: "Entrance to of one of the four 56 foot diversion tunnels."
Illustration on a postcard of giant tunnels creating diversions for the Colorado River during the construction of Hoover Dam. The caption reads: "Diverting the Colorado River through giant tunnels."
Postcard with an illustration of the view of Clark County Court House from the lawn outside. "Clark County Court House, Las Vegas" is typed on the bottom of the postcard. Site Name: Clark County Court House, Las Vegas (Nev.)
Postcard with an illustration of Fremont street looking west at the hotels, stores, and traffic. The typed caption reads: "Looking west on Fremont Street, Las Vegas." Site Name: Fremont Street (Las Vegas, Nev.) Street Address: Fremont Street
Illustration of Boulder Dam, later called Hoover Dam, with the view of lower portals and diversion tunnels. The caption reads: "Boulder Dam, looking upstream, showing Colorado River."
Illustration of Boulder Dam, later called Hoover Dam, construction. Caption reads: "A close-up, showing construction detail, Boulder Dam, Colorado River."
Illustration of the construction of Boulder Dam, later called Hoover Dam. Caption reads: "Boulder Dam and lower portals of diversion tunnels. Colorado River."