Editorial Notes Codification Section 407a, acts Mar. 4, 1933, ch. 275, § 1, 47 Stat. 1568 ; June 16, 1933, ch. 104, 48 Stat. 311 ; Mar. 5, 1934, ch. 46, 48 Stat. 397 ; May 6, 1936, ch. 340, 49 Stat. 1266 , which related to modification of existing contracts for sale of tribal timber, was omitted on authority of act May 6, 1936 , which provided that authority to modify existing contracts for sale of tribal timber expire on Sept. 4, 1936 . Section 407b, act Mar. 4, 1933, ch. 275, § 2, 47 Stat. 1569 , which related to modification of contracts for sale of timber to individual allottee, was omitted in view of the expiration of section 407a of this title . Section 407c, act Mar. 4, 1933, ch. 275, § 3, 47 Stat. 1569 , which related to preference to indian labor in modified contracts, was omitted in view of the expiration of section 407a of this title .