Archival objects in this container: Diversion tunnel under construction at Hoover Dam site, 1931 Construction on walls of Boulder Canyon at Hoover Dam site, 1931 Crew operating construction equipment at Hoover Dam site, 1931 Crew working at Hoover Dam site, 1931 View of Boulder Canyon near Boulder City Nevada, blasting at the top of the canyon, 1931 Crews and equipment in Boulder Canyon at Hoover Dam site, 1931 Boulder Canyon, 1931
