Archival objects in this container: Valve outlets, Hoover Dam, approximately 1935-1939 Valve outlets at Hoover Dam, approximately 1933-1935 Valve outlets at Hoover Dam, approximately 1933-1935 Valve outlets at Hoover Dam, approximately 1933-1935 Visitors at Hoover Dam, approximately 1937-1939 Hoover Dam, approximately 1935-1936 Hoover Dam's upstream side, approximately 1935-1936 Hoover Dam, approximately 1935-1936 Hoover Dam's upstream side, approximately 1935-1940 Hoover Dam's upstream side, approximately 1936-1940 Hoover Dam, approximately 1935-1936 Hoover Dam's upstream side, approximately 1936-1939 Hoover Dam, approximately 1935-1936 Hoover Dam, approximately 1935-1936 Hoover Dam, approximately 1935-1936 Lake Mead, approximately 1936-1939 Speedboat, Hoover Dam, approximately 1935-1936 Hoover Dam's crest, approximately 1935-1940 Dam crest, Hoover Dam, approximately 1935-1936 Hoover Dam's crest, approximately 1936-1939 Hoover Dam, approximately 1937-1939 Dam crest, Hoover Dam, approximately 1935-1936 Hoover Dam's crest, approximately 1933-1934 Hoover Dam's crest, approximately 1935-1936 Hoover Dam's crest, approximately 1935-1936 Load More