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-. "July 16, 1980," G.12.3 Industrial Production (1980-07-16) : 3-3. https://fraser.stlouisfed.org/title/55/item/59633/toc/471999 , accessed on May 7, 2024.