Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Initial Margin Requirements Under Regulations T, U, G, and X," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "1997," Annual Report of the Board of Governors of the Federal Reserve System (1997) : 297-297. https://fraser.stlouisfed.org/title/117/item/2457/toc/411536 , accessed on April 18, 2024.