Section, added Pub. L. 87–792, § 5(a), Oct. 10, 1962, 76 Stat. 826; amended Pub. L. 89–97, title I, § 106(d)(5), July 30, 1965, 79 Stat. 337; Pub. L. 91–172, title V, § 515(c)(1), Dec. 30, 1969, 83 Stat. 645; Pub. L. 93–406, title II, §§ 2004(c)(2), 2005 (c)(11), Sept. 2, 1974, 88 Stat. 986, 992; Pub. L. 94–455, title XIX, § 1906(b)(13)(A), Oct. 4, 1976, 90 Stat. 1834; Pub. L. 97–34, title III, § 313(a), (b)(1), Aug. 13, 1981, 95 Stat. 285, 286; Pub. L. 97–452, § 2(c)(1), Jan. 12, 1983, 96 Stat. 2478; Pub. L. 98–369, div. A, title I, § 42(a)(6), July 18, 1984, 98 Stat. 557, related to qualified bond purchase plans.