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-. "April 15, 1983," G.12.3 Industrial Production (1983-04-15) : 4-4. https://fraser.stlouisfed.org/title/55/item/59666/toc/472577 , accessed on April 18, 2024.