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. "March 1970," Federal Reserve Bulletin (March 1970) : 182-182. https://fraser.stlouisfed.org/title/62/item/21423/toc/6472 , accessed on April 24, 2024.