43 U.S. Code § 146 - Patents to purchasers of lands withdrawn
https://www.law.cornell.edu/uscode/text/43/146
Upon payment of the purchase price the Secretary of the Interior is authorized by appropriate patent to convey all the right, title, and interest in and to said lands to the purchaser at said sale, subject, however, to such reservations, limitations, or conditions as said Secretary may deem proper: Provided, That not over one hundred and sixty acres shall be sold to any one person: Provided further,
That any patent issued hereunder shall contain a reservation to the United States of all oil, gas, coal, and other mineral.
(Jan. 26, 1921, ch. 27, § 2, 41 Stat. 1089.)
43 U.S. Code § 326 - Unsurveyed lands not subject to entry; preferential right of entry after survey
From and after March 28, 1908, the right to
make entry of desert lands under the provisions of sections 321 to 323, 325, and 327 to 329 of this title, shall be restricted to surveyed public lands of the character contemplated by said sections, and no such entries of unsurveyed lands shall be allowed or made of record: Provided, however, That any individual qualified to make entry of desert lands under said sections who has, prior to survey, taken possession of a tract of unsurveyed desert land not exceeding in area three hundred and twenty acres in compact form, and has reclaimed or has in good faith commenced the work of reclaiming the same, shall have the preference right to make entry of such tract under said sections, in conformity with the public land surveys, within ninety days after the filing of the approved plat of survey in the district land office.
(Mar. 28, 1908, ch. 112, § 1, 35 Stat. 52.)