authority: 5 U.S.C. 301 (Interprets or applies Act of Apr. 26, 1906, ch. 1876, 34 Stat. 137, see 25 U.S.C. 355nt (1970); Act of May 27, 1908, ch. 199, 35 Stat. 312, see 25 U.S.C. 355nt (1970); Act of June 14, 1918, ch. 101, 40 Stat. 606, 25 U.S.C. 355,375; Act of Apr. 12, 1926, ch. 115, 44 Stat. 239, see 25 U.S.C. 355nt (1970); Act of June 26, 1936, ch. 831, 49 Stat. 1967, 25 U.S.C. 501-509 (1970); Act of Aug. 4, 1947, ch. 458, 61 Stat. 731, 25 U.S.C. 502 (1970) and see 25 U.S.C. 355nt (1970); Act of Aug. 12, 1953, ch. 409, 67 Stat. 558, 25 U.S.C. 375c (1970) and see 25 U.S.C. 355nt (1970); Act of Aug. 11, 1955, ch. 786, 69 Stat. 666, see 25 U.S.C. 355nt (1970); Act of Aug. 29, 1967, Pub. L. 90-76, 81 Stat. 177, 25 U.S.C. 786-788 (1970); and Act of May 7, 1970, Pub. L. 91-240, 84 Stat. 203, 25 U.S.C. 375d (1970))