The regulations in this subpart apply to the sale of certain classes of lands that are subject to the reclamation laws and that may be sold under one of the following statutes:

(a) The Act of May 20, 1920 (41 Stat. 605; 43 U.S.C. 375);

(b) The Act of May 16, 1930 (46 Stat. 367; 43 U.S.C. 424 through 424e); or

(c) The Act of March 31, 1950 (64 Stat. 39; 43 U.S.C. Sup. 375b through 375f).