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. "November 1969," Federal Reserve Bulletin (November 1969) : 104-104. https://fraser.stlouisfed.org/title/62/item/21419/toc/292336 , accessed on April 18, 2024.