Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Market Groupings, Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "May 1967," Federal Reserve Bulletin (May 1967) : 150-150. https://fraser.stlouisfed.org/title/62/item/21389/toc/390767 , accessed on April 25, 2024.