Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Par Collection System of the Federal Reserve Banks," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "February 1940," Federal Reserve Bulletin (February 1940) : 12-19. https://fraser.stlouisfed.org/title/62/item/21022/toc/431904 , accessed on June 5, 2023.