2 U.S.C. § 158: Deposits by Library of Congress Trust Fund Board with Treasurer of United States

In the absence of any specification to the contrary, the board may deposit the principal sum, in cash, with the Treasurer of the United States as a permanent loan to the United States Treasury, and the Treasurer shall thereafter credit such deposit with interest at a rate which is the higher of the rate of 4 per centum per annum or a rate which is 0.25 percentage points less than a rate determined by the Secretary of the Treasury, taking into consideration the current average market yield on outstanding long-term marketable obligations of the United States, adjusted to the nearest one-eighth of 1 per centum, payable semi-annually, such interest, as income, being subject to disbursement by the Librarian of Congress for the purposes specified: Provided, however , That the total of such principal sums at any time so held by the Treasurer under this authorization shall not exceed the sum of $10,000,000.