25 C.F.R. § 152.21
Certain tribal land may be sold or exchanged pursuant to the Acts of February 14, 1920 (41 Stat. 415; 25 U.S.C. 294 ); June 18, 1934 (48 Stat. 984; 25 U.S.C. 464 ); August 10, 1939 (53 Stat. 1351; 25 U.S.C. 463(e) ); July 1, 1948 (62 Stat. 1214); June 4, 1953 (67 Stat. 41; 25 U.S.C. 293(a) ); July 28, 1955 (69 Stat. 392), as amended August 31, 1964 (78 Stat. 747; 25 U.S.C. 608 - 608c ); June 18, 1956 (70 Stat. 290; 25 U.S.C. 403a-2 ); July 24, 1956 (70 Stat. 626); May 19, 1958 (72 Stat. 121; 25 U.S.C. 463 , Note); September 2, 1958 (72 Stat. 1762); April 4, 1960 (74 Stat. 13); April 29, 1960 (74 Stat. 85); December 11, 1963 (77 Stat. 349); August 11, 1964 (78 Stat. 389), and pursuant to other authorizing acts. Except as otherwise provided by law, and as far as practicable, the regulations in this part 152 shall be applicable to sale or exchanges of such tribal land.
25 C.F.R. §152.21