Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Treasury Currency Outstanding," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "April 1939," Federal Reserve Bulletin (April 1939) : 65-65. https://fraser.stlouisfed.org/title/62/item/21012/toc/186809 , accessed on April 24, 2024.