25 U.S. Code § 402a - Lease of unallotted irrigable lands for farming purposes
The unallotted irrigable lands on any Indian reservation may be leased for farming purposes for not to exceed ten years with the consent of the tribal council, business committee, or other authorized body representative of the Indians, under such rules and regulations as the Secretary of the Interior may prescribe.
Source(July 3, 1926, ch. 787, 44 Stat. 894.)