- ACT MAR. 8, 1918, CH. 20, 40 STAT. 440
- ACT DEC. 18, 1941, CH. 593, 55 STAT. 838
- ACT MAR. 27, 1942, CH. 199, 56 STAT. 176
- ACT JULY 2, 1940, CH. 508, 54 STAT. 714
- ACT OCT. 2, 1942, CH. 578, 56 STAT. 765
- ACT DEC. 30, 1947, CH. 526, 61 STAT. 945
- ACT JULY 1, 1948, CH. 785, 62 STAT. 1210
- PUB. L. 92–39, JULY 1, 1971, 85 STAT. 92
- ACT AUG. 7, 1953, CH. 339, 67 STAT. 417
- ACT JUNE 15, 1951, CH. 138, 65 STAT. 69