Section, act July 14, 1955, ch. 360, title III, § 316, formerly § 13, as added Dec. 17, 1963,
Pub. L. 88–206, § 1,
77 Stat. 401; renumbered title III, § 306, and amended Oct. 20, 1965,
Pub. L. 89–272, title I, § 101(4), (6), (7),
79 Stat. 992; Oct. 15, 1966,
Pub. L. 89–675, § 2(a),
80 Stat. 954; renumbered § 309 and amended Nov. 21, 1967,
Pub. L. 90–148, § 2,
81 Stat. 506; renumbered § 316 and amended Dec. 31, 1970,
Pub. L. 91–604, §§ 12(a),
13
(b),
84 Stat. 1705, 1709; Apr. 9, 1973,
Pub. L. 93–15, § 1(c),
87 Stat. 11; June 22, 1974,
Pub. L. 93–319, § 13(c),
88 Stat. 265, authorized appropriations for air pollution control. See section
7626 of this title.