Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Kinds of Money in Circulation," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "May 1939," Federal Reserve Bulletin (May 1939) : 54-54. https://fraser.stlouisfed.org/title/62/item/21013/toc/249093 , accessed on April 26, 2024.