Section, act Aug. 26, 1954, ch. 937, ch. IV, § 549, as added July 18, 1956, ch. 627, § 1(d), 70 Stat. 565; amended Aug. 14, 1957, Pub. L. 85–141, § 11(e), 71 Stat. 365; June 30, 1958, Pub. L. 85–477, ch. V, § 501(34), 72 Stat. 272, authorized an amount equal to 25 per centum of funds authorized to be appropriated for any fiscal year for purposes of sections 1891 to 1896, 1897, 1898, or 1923 of this title to be continued available for three months beyond end of fiscal year for which appropriated.