Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. Interpretation of Law or Regulation: "Principal Amount", Section 5(b), Defined as Principal Amount Lent to Obligor, Excluding Interest, etc., Number S-319, Volume 55, Page 301, Mimeograph Letters and Statements of the Board. Board of Governors of the Federal Reserve System (U.S.), 1935-. https://fraser.stlouisfed.org/archival/4957/item/509614, accessed on October 14, 2026.