Okla. Stat. tit. 64, § 1089

Each and all of the rights, powers and remedies granted and conferred by the terms of this act shall be cumulative and shall be construed to be in addition to those already existing, except that at any private or voluntary sale of state-owned lands by the Commissioners of the Land Office such sale shall be held only upon resolution adopted by a unanimous vote of the Commissioners of the Land Office.