Section,
Pub. L. 87–70, title VII, § 704, June 30, 1961,
75 Stat. 185;
Pub. L. 89–117, title IX, § 909(d), Aug. 10, 1965,
79 Stat. 497;
Pub. L. 90–19, § 18(c), May 25, 1967, 81 Stat 25;
Pub. L. 91–609, title IV, § 401, Dec. 31, 1970,
84 Stat. 1782, related to conversion to other uses.