25 U.S.C. § 344
If any Indian of a tribe whose surplus lands have been ceded or opened to disposal has received an allotment embracing lands unsuitable for allotment purposes, such allotment may be canceled and other unappropriated, unoccupied, and unreserved land of equal area, within the ceded portions of the reservation upon which such Indian belongs, allotted to him upon the same terms and with the same restrictions as the original allotment, and lands described in any such canceled allotment shall be disposed of as other ceded lands of such reservation. This provision shall not apply to the lands formerly comprising Indian Territory. The Secretary of the Interior is authorized to prescribe rules and regulations to carry this law into effect.
25 U.S.C. § 344