30 U.S.C. § 233a
Permits or leases of certain lands in Oklahoma; retention of royalties
The Secretary of the Interior is directed to retain in his custody until otherwise directed by law the 12½ per centum and other royalties heretofore or hereafter received by him in pursuance of section 233 of this title.
( Mar. 4, 1925, ch. 550, § 2 , 43 Stat. 1302 .)