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-. "November 13, 1981," G.12.3 Industrial Production (1981-11-13) : 5-5. https://fraser.stlouisfed.org/title/55/item/59649/toc/472264 , accessed on March 29, 2024.