The Commissioner of Indian Affairs shall cause a seal to be made and provided for the said office, with such device as the President of the United States shall approve, and copies of any public documents, records, books, maps, or papers belonging to or on the files of said office, authenticated by the seal and certified by the Commissioner thereof, or by such officer as may, for the time being, be acting as or for such Commissioner, shall be evidence equally with the originals thereof.
25 U.S. Code § 6 - Seal; authenticated and certified documents; evidence
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.