Section, acts May 28, 1956, ch. 327, title I, § 107, 70 Stat. 191; June 11, 1960, Pub. L. 86–507, § 1(8), 74 Stat. 200; June 29, 1961, Pub. L. 87–62, § 1(a), 75 Stat. 129; July 3, 1962, Pub. L. 87–521, 76 Stat. 135, set out terms to be included in producers’ contracts under conservation reserve program and made provisions for use of advertising and bid procedures, termination of contracts, and notice, hearing, and judicial review of Secretary’s action in terminating a contract.