Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Convertible Foreign Currency Held by Federal Reserve Banks," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "March 1972," Federal Reserve Bulletin (March 1972) : 140-140. https://fraser.stlouisfed.org/title/62/item/21447/toc/35379 , accessed on May 4, 2024.