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-. "January 15, 1981," G.12.3 Industrial Production (1981-01-15) : 3-3. https://fraser.stlouisfed.org/title/55/item/59640/toc/472112 , accessed on May 3, 2024.