Section, Pub. L. 93–415, title II, § 299, formerly § 261, Sept. 7, 1974, 88 Stat. 1129; Pub. L. 94–273, § 32(b), Apr. 21, 1976, 90 Stat. 380; Pub. L. 94–503, title I, § 130(a), Oct. 15, 1976, 90 Stat. 2425; Pub. L. 95–115, § 6(b), Oct. 3, 1977, 91 Stat. 1058; Pub. L. 96–509, §§ 2(a), 15, Dec. 8, 1980, 94 Stat. 2750, 2760; Pub. L. 98–473, title II, § 640, Oct. 12, 1984, 98 Stat. 2121; renumbered § 291 and amended Pub. L. 100–690, title VII, §§ 7265, 7266(3), Nov. 18, 1988, 102 Stat. 4448, 4449; Pub. L. 101–204, title X, §§ 1001(e)(1), 1002, Dec. 7, 1989, 103 Stat. 1827; renumbered § 299 and amended Pub. L. 102–586, § 2(i)(1)(B), (j), Nov. 4, 1992, 106 Stat. 5006, 5016; Pub. L. 107–273, div. C, title II, § 12213, Nov. 2, 2002, 116 Stat. 1891, authorized appropriations for this subchapter for fiscal years 2003 to 2007.

Section was formerly classified to section 5671 of Title 42, The Public Health and Welfare.