43 U.S.C. § 91: Deposit in Treasury of unearned fees and un­official moneys

Officers of district land officers, as designated by the Secretary of the Interior are authorized, under the direction of the Secretary of the Interior or such officer as he may designate, to deposit to the credit of the Treasurer of the United States all unearned fees and unofficial moneys that have been carried upon the books of their respective offices for a period of five years or more, which sums shall be covered into the Treasury by warrant and carried to the credit of the parties from whom such fees or moneys were received, and into an appropriation account to be denominated “Outstanding liabilities.”