Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. Letter From Asst. Secretary McClelland re Code Words in Connection with the Pledge of Government Securities as Collateral for Federal Reserve Notes, Number X-7151, Volume 36, Page 349, 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/504713, accessed on March 16, 2026.