30 U.S. Code § 82 - New or supplemental patents, in case of lands subsequently classified as noncoal
The Secretary of the Interior is authorized and directed in cases where patents for public lands have been issued to entrymen under the provisions of sections 81 and 83 to 85 of this title, reserving to the United States all coal deposits therein, and lands so patented are subsequently classified as noncoal in character, to issue new or supplemental patents without such reservation.
Source(Apr. 14, 1914, ch. 55, 38 Stat. 335.)