Sections were derived from the following acts:

Feb. 20, 1905, ch. 592, §§ 1 to 23, 25–30, 33 Stat. 724 to 731.

May 4, 1906, ch. 2081, §§ 1 to 3, 34 Stat. 168, 169.

Mar. 2, 1907, ch. 2573, §§ 1, 2, 34 Stat. 1251, 1252.

Feb. 18, 1909, ch. 144, 35 Stat. 627, 628.

Feb. 18, 1911, ch. 113, 36 Stat. 918.

Mar. 3, 1911, ch. 231, § 291, 36 Stat. 1167.

Aug. 24, 1912, ch. 370, § 5, 37 Stat. 498.

Jan. 8, 1913, ch. 7, 37 Stat. 649.

Mar. 19, 1920, ch. 104, §§ 1 to 9, 41 Stat. 533 to 535.

June 7, 1924, ch. 341, 43 Stat. 647.

Mar. 4, 1925, ch. 535, §§ 1, 3, 43 Stat. 1268, 1269.

Mar. 2, 1929, ch. 488, § 2(b), 45 Stat. 1476.

Apr. 11, 1930, ch. 132, § 4, 46 Stat. 155.

June 7, 1934, ch. 426, 48 Stat. 926.

June 20, 1936, ch. 617, 49 Stat. 1539.

June 25, 1936, ch. 804, 49 Stat. 1921.

June 10, 1938, ch. 332, §§ 1 to 3, 5, 52 Stat. 638, 639.