Board of Governors of the Federal Reserve System (U.S.), 1935-. "Market Groupings, Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "June 14, 1971," G.12.3 Industrial Production (1971-06-14) : 2-2. https://fraser.stlouisfed.org/title/55/item/59558/toc/468208 , accessed on May 13, 2024.