Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Margin Requirements," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "1940," Annual Report of the Board of Governors of the Federal Reserve System (1940) : 52-52. https://fraser.stlouisfed.org/title/117/item/2498/toc/368553 , accessed on April 18, 2024.