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. "September 1940," Federal Reserve Bulletin (September 1940) : 61-61. https://fraser.stlouisfed.org/title/62/item/21029/toc/137231 , accessed on March 28, 2024.