Section 2415, act Aug. 7, 1956, ch. 1025, § 16, 70 Stat. 1085 , authorized appointment of an advisory committee. Section 2416, act Aug. 7, 1956, ch. 1025, § 17, 70 Stat. 1085 , provided for studies. Section 2417, act Aug. 7, 1956, ch. 1025, § 18, 70 Stat. 1085 , prescribed additional functions of the Administrator. Section 2418, act Aug. 7, 1956, ch. 1025, § 19, 70 Stat. 1086 , reserved rights in acquired real estate. Section 2419, act Aug. 7, 1956, ch. 1025, § 20, 70 Stat. 1086 , related to exemption of real estate from taxation. Section 2420, act Aug. 7, 1956, ch. 1025, § 21, 70 Stat. 1086 , provided for annual reports. Section 2421, act Aug. 7, 1956, ch. 1025, § 22, 70 Stat. 1086 , defined terms used in this chapter. See section 4001 et seq. of this title . Statutory Notes and Related Subsidiaries Effective Date of Repeal Repeal effective 120 days following Aug. 1, 1968 , or such later date prescribed by the Secretary but in no event more than 180 days following Aug. 1, 1968 , see section 1377 of Pub. L. 90–448 , set out as an Effective Date note under section 4001 of this title .