Archival objects in this container: Black Canyon, Hoover Dam, approximately 1931-1935 Black Canyon, Colorado, approximately 1930-1936 Hoover Dam, approximately 1931-1935 Hoover Dam, approximately 1931-1935 Diverson Tunnel number two on Nevada side, Hoover Dam, putting in the ceiling, approximately 1931-1936 Diverson Tunnel number two on Nevada side, Hoover Dam, putting in the ceiling, approximately 1931-1936 Tunnels, Hoover Dam, approximately 1931-1935 Diversion tunnel number 3 on the Arizona side of Hoover Dam, approximately 1931-1935 Tunnels, Hoover Dam, approximately 1931-1935 Tunnels, Hoover Dam, approximately 1931-1935 Penstock tunnel, Hoover Dam, approximately 1931-1935 Penstock pipe, Hoover Dam, approximately 1931-1935 Construction work, Hoover Dam, approximately 1931-1935 Hoover Dam construction, approximately 1933-1934 Construction site, Hoover Dam, approximately 1931-1935 Union Pacific streamliner, Hoover Dam, approximately 1931-1935 Union Pacific streamliner, Hoover Dam, approximately 1931-1935 Hoover Dam's downstream face, approximately 1933-1935 Construction site, Hoover Dam, approximately 1931-1935 Construction site, Hoover Dam, approximately 1931-1935 Construction site, Hoover Dam, approximately 1931-1935 Construction site, Hoover Dam, approximately 1931-1935 Downstream face of Hoover Dam, approximately 1931-1934 Construction site, Hoover Dam, approximately 1931-1934 Construction site, Hoover Dam, approximately 1931-1935