Archival objects in this container: Blast during the construction of Hoover Dam, 1931 Worker using heavy equipment at the Hoover Dam construction site, 1931 Boulder Canyon, Nevada, 1931 Construction worker at Hoover Dam, 1931 Construction workers in Boulder Canyon, Nevada, 1931 Boulder Canyon, Nevada with construction crew on the right, 1931 Two construction workers at the bottom of Boulder Canyon, Nevada, 1931 Aerial view of the Colorado River in Boulder Canyon, Nevada, 1931 Aerial view of Boulder Canyon, Nevada, 1931 Boulder Canyon floor after water from the Colorado River had been diverted, 1931 Floor of Boulder Canyon during the early stages of construction of Hoover Dam, 1931 Inside machinery room at Hoover Dam, approximately 1931 Machinery at Hoover Dam site, approximately 1931 Bridge across Boulder Canyon, Nevada at the Hoover Dam site, 1931 Workers in Boulder Canyon, Nevada at the Hoover Dam site, 1931 Railroad tracks being laid at the Hoover Dam construction site, 1931 Highway near Boulder City, Nevada, 1931 Construction crew in Boulder Canyon, Nevada, 1931 Worker operating machinery at Hoover Dam site, 1931 Construction crews in Boulder Canyon, Nevada, 1931 Equipment at Hoover Dam site, 1931 Photograph of blueprint showing general layout of Hoover Dam, approximately 1930 to 1935 Workers operating heavy machinery near Boulder City, Nevada, approximately 1930 to 1940 Highway near Boulder City, Nevada, 1931 Machinery at Hoover Dam site, inside of a building, 1931 Load More