Board of Governors of the Federal Reserve System (U.S.), 1935-. "Industry Groupings, Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "April 15, 1982," G.12.3 Industrial Production (1982-04-15) : 6-6. https://fraser.stlouisfed.org/title/55/item/59654/toc/472361 , accessed on April 23, 2024.