Archival objects in this container: Workers testing the valves for jet flow gates at the Hoover Dam construction site, approximately 1934-1936 Jet flow gates at the Hoover Dam construction site, approximately 1934-1936 Water vapor from above the Hoover Dam jet flow gates, approximately 1935-1936 Nearly completed Hoover Dam and surroundings, approximately 1935-1936 Hoover Dam with open jet flow gates, approximately 1935-1936 Lake Mead and Hoover Dam, approximately 1934-1936 Hoover Dam with open jet flow gates, approximately 1935-1936 Hoover Dam with open jet flow gates, approximately 1935-1936 Hoover Dam water outlets, approximately 1934-1936 Hoover Dam with open jet flow gates, approximately 1934-1935 Hoover Dam with open jet flow gates, approximately 1935-1936 Hoover Dam with open jet flow gates, approximately 1935-1936 Hoover Dam's downstream face and outlet works, approximately 1934-1936 Hoover Dam with open jet flow gates, approximately 1935-1936 Hoover Dam with open jet flow gates, approximately 1935-1936 Hoover Dam with open jet flow gates, approximately 1935-1936 Hoover Dam with open jet flow gates, approximately 1935-1936 Hoover Dam with open jet flow gates, approximately 1935-1936 Hoover Dam with open jet flow gates, approximately 1935-1936 Hoover Dam with open jet flow gates, approximately 1935-1936 Hoover Dam with open jet flow gates, approximately 1935-1936 Hoover Dam with open jet flow gates, approximately 1935-1936 Hoover Dam with open jet flow gates, approximately 1935-1936 Hoover Dam with open jet flow gates, approximately 1935-1936 Hoover Dam with open jet flow gates, approximately 1935-1936 Load More