Archival objects in this container: Construction site, Hoover Dam, approximately 1931-1935 Concrete plant, Hoover Dam, approximately 1931-1935 Intake towers, Hoover Dam, approximately 1931-1935 Construction site, Hoover Dam, approximately 1931-1935 Hoover Dam, approximately 1931-1935 Construction site, Hoover Dam, approximately 1932-1935 Hoover Dam, approximately 1932-1935 Construction site, Hoover Dam, approximately 1936-1939 Construction site, Hoover Dam, approximately 1930-1935 Hoover Dam's downstream face, approximately 1934-1936 Hoover Dam's downstream face, approximately 1933-1935 Hoover Dam's downstream face, approximately 1934-1936 Outlet valves, Hoover Dam, approximately 1935-1939 Hoover Dam's downstream side, approximately 1935-1936 Outlet valves, Hoover Dam, approximately 1935-1939 Hoover Dam's downstream face, approximately 1935-1939 Outlet valves, Hoover Dam, approximately 1935-1939 Hoover Dam's downstream face, approximately 1931-1935 Outlet valves, Hoover Dam, approximately 1935-1939 Outlet valves, Hoover Dam, approximately 1935-1939 Outlet valves, Hoover Dam, approximately 1935-1939 Construction site, Hoover Dam, approximately 1935-1939 98 valve outlet at Hoover Dam, approximately 1931-1935 Valve outlets at Hoover Dam, approximately 1933-1935 Valve outlets, Hoover Dam, approximately 1935-1939