Archival objects in this container: Open valves at Hoover Dam outlet works, approximately 1934-1936 Open valves at Hoover Dam outlet works, approximately 1934-1936 Open valves at Hoover Dam outlet works, approximately 1934-1936 Open valves at Hoover Dam outlet works, approximately 1934-1936 Open valves at Hoover Dam outlet works, approximately 1934-1936 Open valves at Hoover Dam outlet works, approximately 1934-1936
