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. "October 1970," Federal Reserve Bulletin (October 1970) : 70-70. https://fraser.stlouisfed.org/title/62/item/21430/toc/281170 , accessed on May 9, 2024.