Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Market Groupings, Not Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "April 1970," Federal Reserve Bulletin (April 1970) : 145-145. https://fraser.stlouisfed.org/title/62/item/21424/toc/369740 , accessed on May 8, 2024.