Archival objects in this container: Construction on roads at the walls of Black Canyon at the Hoover Dam construction site, approximately 1930-1935 Suspension bridge under construction at the Hoover Dam construction site, approximately 1930-1935 Construction of roads and a bridge across the Colorado River at the Hoover Dam construction site, approximately 1930-1935 Construction of roads and a bridge across the Colorado River at the Hoover Dam construction site, approximately 1930-1935 Construction of roads and a bridge across the Colorado River at the Hoover Dam construction site, approximately 1930-1935 Construction of a bridge across the Colorado River, approximately 1930-1935 Construction of roads and a bridge across the Colorado River at the Hoover Dam construction site, approximately 1930-1935 Suspension bridge under construction at the Hoover Dam construction site, approximately 1930-1935 Suspension bridge under construction at the Hoover Dam construction site, approximately 1930-1935 Suspension bridge under construction at the Hoover Dam construction site, approximately 1930-1935 Suspension bridge under construction at the Hoover Dam construction site, approximately 1930-1935 Construction of a bridge across Colorado River, approximately 1930-1935 Construction of roads and bridge across Colorado River, approximately 1930-1935 Railroad siding construction on the wall of the canyon during Hoover Dam construction, approximately 1930-1935 Cable transport construction at the site of the Hoover Dam, approximately 1930-1935