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 1931," Federal Reserve Bulletin (May 1931) : 55-55. https://fraser.stlouisfed.org/title/62/item/20713/toc/35790 , accessed on April 18, 2024.