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. "December 1938," Federal Reserve Bulletin (December 1938) : 28-28. https://fraser.stlouisfed.org/title/62/item/21008/toc/216482 , accessed on April 25, 2024.