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.