Access Restricted Archival objects in this container: 230: "Hoover Dam as it will look when completed" rendering reproduction: photographic postcard, approximately 1930 to 1939 6: "At site of Boulder Dam looking upstream": photographic postcard, approximately 1930 to 1939 373: "Spirit of the West, Las Vegas, Nevada": photographic postcard, approximately 1930 to 1939 345: The Great White Throne, Zion National Park, Utah: photographic postcard, approximately 1930 to 1939 184: Workers pouring concrete at Hoover Dam: photographic postcard, approximately 1930 to 1939 23: "Changing the scenery at Black Canyon, Hoover Dam Project": photographic postcard, approximately 1930 to 1939 5: "The Crow's Nest at the Dam site": photographic postcard, approximately 1930 to 1939 396: Administration building, Boulder City, Nevada: photographic postcard, approximately 1930 to 1939 45: Explosion at Cape Horn, Hoover Dam site: photographic postcard, approximately 1930 to 1939 265: Hoover Dam work site: photographic postcard, approximately 1930 to 1939 16: "Lower portals of the diversion tunnels, Boulder Dam on the Colorado River": photographic postcard, approximately 1930 to 1939 12: Night view, "the Broadway of the Hoover Dam": photographic postcard, approximately 1930 to 1939 293: Spectators at Lookout Point, Hoover Dam: photographic postcard, approximately 1930 to 1939 267: "A cloud bank from 3,500 dynamite shots at Hoover Dam, Nevada": photographic postcard, approximately 1933 November 13 221: "Diversion tunnel no. 2 with floor and side walls concreted, Boulder Dam": photographic postcard, approximately 1930 to 1939 229: "Diversion tunnel no. 4, a hole 50 feet in diameter surrounded by 3 feet of concrete, Hoover Dam": photographic postcard, approximately 1930 to 1939 259: Aerial view of Black Canyon and the Hoover Dam site with written text denoting landmarks: photographic postcard, approximately 1930 to 1939 285: High scalers working at Hoover Dam: photographic postcard, approximately 1930 to 1939 263: "A crew of high scalers going to work" suspended over the Colorado River, Hoover Dam: photographic postcard, approximately 1930 to 1939 187: "A wash out, Hoover Dam project": photographic postcard, approximately 1930 to 1939 290: View of Lookout Point and the Colorado River, Hoover Dam: photographic postcard, approximately 1930 to 1939 365: "Construction of intake towers at Boulder Dam": photographic postcard, approximately 1930 to 1939 270: "The work goes on night and day at Hoover Dam": photographic postcard, approximately 1930 to 1939 272: "Tunnels #3 & #4 taking waters of Colorado River around Dam site, Hoover Dam Project": photographic postcard, approximately 1930 to 1939 397: View of construction of the Hoover Dam: photographic postcard, approximately 1930 to 1939 Load More