Board of Governors of the Federal Reserve System (U.S.), 1935-. "Market Groupings, Not 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) : 4-4. https://fraser.stlouisfed.org/title/55/item/59640/toc/472114 , accessed on April 23, 2024.