Access Restricted Archival objects in this container: Caravan of over 500 automobiles on their way to visit the Boulder Canyon Project in Boulder City, 1932 November Showing the completed construction of Diversion Tunnel No. 4, one of four 50-foot diversion tunnels at Hoover Dam, 1932 October 26 Nevada spillway at Hoover Dam under construction, 1933 May Dr. Ray Lyman Wilbur, Secretary of Interior, naming the Boulder Dam at a ceremony celebrating the beginning of work on the Boulder Canyon Project and the beginning of the construction of Union Pacific Railroad from Boulder Junction (Bracken Junction) to the dam site, 1930 September 17 Upstream view of Black Canyon from the Hoover Dam construction site, 1932 August 01 Deep-sea divers from the U.S. Navy participating in the Lake Mead Sedimentation Survey, approximately 1948-1949 Black Canyon during the construction of Hoover Dam, 1933 May Excavation activities at the bed of Hoover Dam, approximately 1932-1933 Dynamite blasts being fired simultaneously for the locations of the Arizona (left) and Nevada (right) intake towers at Hoover Dam, 1932 October 18 Downstream view of the Hoover Dam construction site from the lower slope of the upper cofferdam, 1932 December 31 Excavation work on Boulder Dam at night, approximately 1932-1933 Entrance to the Boulder City Elementary School during its construction, 1932 August First eighth grade class of Boulder City Elementary School; school principal Leila Tilley is visible in the back of the classroom behind the students, 1932 October 05 Schoolchildren in front of the Boulder City Elementary School, 1932 October 05 Privy used by the schoolchildren of Boulder City, 1932 October 05 One of Boulder City's first schools, 1932 Pupil desk and seat used in Boulder City School, approximately 1932-1933 Boulder City from Water Tank Hill, 1933 March 03 Walker R. Young and an unidentified individual standing beside a Department of the Interior vehicle, 1933 March 03 Aerial view of Hoover Dam, its power plant, and Lake Mead, 1984 March 21 Upstream view of Black Canyon from a point on the Nevada side approximately a half mile below the Hoover Dam construction site, 1922 April 12 Bucket discharging a load into the upstream face of Hoover Dam, 1934 October 02 Upstream face of Hoover Dam, 1935 February 28