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-. "December 16, 1981," G.12.3 Industrial Production (1981-12-16) : 5-5. https://fraser.stlouisfed.org/title/55/item/59650/toc/472293 , accessed on March 28, 2024.