Section, acts Aug. 26, 1954, ch. 937, ch. II, § 409, 
68 Stat. 845; July 8, 1955, ch. 301, § 8(g), 
69 Stat. 286; July 18, 1956, ch. 627, § 8(g), 
70 Stat. 558; Aug. 14, 1957, 
Pub. L. 85–141, § 8(i), 
71 Stat. 361; June 30, 1958, 
Pub. L. 85–477, ch. II, § 205(g), 
72 Stat. 267; July 24, 1959, 
Pub. L. 86–108, ch. II, § 205(i), 
73 Stat. 250; May 14, 1960, 
Pub. L. 86–472, ch. II, § 204(i), 
74 Stat. 137, authorized payment of ocean freight charges and provided for arrangements for free entry.