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. "March 1940," Federal Reserve Bulletin (March 1940) : 39-39. https://fraser.stlouisfed.org/title/62/item/21023/toc/383762 , accessed on March 29, 2024.