Section, acts Jan. 25, 1929, ch. 102, title III, 45 Stat. 1119; Apr. 18, 1930, ch. 184, title III, 46 Stat. 198; Feb. 23, 1931, ch. 280, title III, 46 Stat. 1334; July 1, 1932, ch. 361, title III, 47 Stat. 502; Mar. 1, 1933, ch. 144, title III, 47 Stat. 1393; Apr. 7, 1934, ch. 104, title III, 48 Stat. 551; Mar. 22, 1935, ch. 39, § 1, 49 Stat. 90; May 15, 1936, ch. 405, § 1, 49 Stat. 1336; June 16, 1937, ch. 359, title III, § 1, 50 Stat. 287; Apr. 27, 1938, ch. 180, title III, § 1, 52 Stat. 273; June 29, 1939, ch. 248, title III, 53 Stat. 909, related to purchases of supplies and equipment on the open market.