Section,
Pub. L. 88–164, title IV, § 401, Oct. 31, 1963,
77 Stat. 296;
Pub. L. 90–31, § 4(a), June 24, 1967,
81 Stat. 79;
Pub. L. 91–211, title I, §§ 102(b),
104,
105, Mar. 13, 1970,
84 Stat. 54–56;
Pub. L. 91–517, title I, § 102(a), Oct. 30, 1970,
84 Stat. 1324;
Pub. L. 94–63, title III, § 305(a), July 29, 1975,
89 Stat. 333, related to definitions, Federal percentages, and promulgation of percentages.