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. "August 1970," Federal Reserve Bulletin (August 1970) : 119-119. https://fraser.stlouisfed.org/title/62/item/21428/toc/302685 , accessed on April 18, 2024.