Access Restricted Archival objects in this container: 82: "The Old Ranch, Las Vegas, Nevada": photographic postcard, approximately 1930 to 1939 298: "High scalers clinging to the cliff, Hoover Dam": photographic postcard, approximately 1930 to 1939 288: "Upstream view showing the lower portals in foreground, Boulder Dam": photographic postcard, approximately 1930 to 1939 307: "View upstream, Hoover Dam, reproduced by permission of Fairchild Aerial Surveys Inc.": photographic postcard, approximately 1930 to 1939 299: Boulder Dam construction at night: photographic postcard, approximately 1930 to 1939 309: "Looking upstream, Hoover Dam Project, reproduced by permission of Fairchild Aerial Surveys Inc.": photographic postcard, approximately 1930 to 1939 340: "High-Mix concrete plant, Boulder Dam": photographic postcard, approximately 1930 to 1939 342: "The Dam is Getting Boulder and Bolder": photographic postcard, approximately 1930 to 1939 343: "Keyway of Boulder Dam": photographic postcard, approximately 1930 to 1939 348: Aerial view of Black Canyon: photographic postcard, 1930 366: Vehicles and people at Observation Point, Boulder Dam: photographic postcard, approximately 1930 to 1939 355: Vehicles and people at Observation Point, Boulder Dam: photographic postcard, approximately 1930 to 1939 353: High scalers suspended on the canyon wall, Boulder Dam: photographic postcard, approximately 1930 to 1939 367: Boulder Dam under construction: photographic postcard, 1934 January 15 357: View of Boulder Dam from Observation Point: photographic postcard, 1933 October 379: View of Fortification Hill with the Colorado River in the foreground: photographic postcard, approximately 1930 to 1939 394: View of a Union Pacific train in the desert: photographic postcard, approximately 1930 to 1939 421: Boulder Dam construction at night: photographic postcard, approximately 1930 to 1939 383: Boulder Dam construction at night: photographic postcard, 1934 430: "Boulder Dam from Nevada side": photographic postcard, approximately 1930 to 1939 436: "Huge concrete buckets used on Boulder Dam": photographic postcard, approximately 1930 to 1939 391: Boulder Dam under construction: photographic postcard, 1934 April 426: A highline rigger suspended in the air at Boulder Dam: photographic postcard, approximately 1930 to 1939 480: "Boulder Lake" (Lake Mead): photographic postcard, approximately 1930 to 1939 466: "Boulder Dam Lake" (Lake Mead): photographic postcard, approximately 1930 to 1939 Load More