Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. Letter From Asst. Secretary Bethea re Method of Amortizing Premium on Different Lots of Bonds of Same Issue Under Comptroller's Regulations Regarding Investment Securities, Number S-28, Volume 47, Page 446, 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/506887, accessed on March 14, 2026.