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-. "March 14, 1980," G.12.3 Industrial Production (1980-03-14) : 3-3. https://fraser.stlouisfed.org/title/55/item/59630/toc/471926 , accessed on April 23, 2024.