25 U.S. Code § 5 - Record of deeds by Indians requiring approval
The Commissioner of Indian Affairs is hereby empowered and directed to continue to make and keep a record of every deed executed by any Indian, his heirs, representatives, or assigns, which may require the approval of the President of the United States or of the Secretary of the Interior, whenever such approval shall have been given, and the deed so approved returned to said office.
For transfer of functions of other officers, employees, and agencies of Department of the Interior, with certain exceptions, to Secretary of the Interior, with power to delegate, see Reorg. Plan No. 3 of 1950, §§ 1, 2, eff. May 24, 1950, 15 F.R. 3174,64 Stat. 1262, set out in the Appendix to Title 5, Government Organization and Employees.