43 Tex. Admin. Code § 21.103
The commission requires the abutting or adjoining land and mineral owners or the original grantors, their heirs or assigns, to furnish the department with satisfactory proof of his or their ownership, when such proof is necessary to establish eligibility to receive the surplus land interests in accordance with the law.
Source Note:The provisions of this §21.103 adopted to be effective January 1, 1976.