Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Kinds of United States Currency Outstanding and in Circulation," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "February 1971," Federal Reserve Bulletin (February 1971) : 104-104. https://fraser.stlouisfed.org/title/62/item/21433/toc/6140 , accessed on May 10, 2024.