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-. "September 14, 1986," G.12.3 Industrial Production (1986-09-14) : 4-4. https://fraser.stlouisfed.org/title/55/item/59710/toc/473341 , accessed on April 25, 2024.