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 15, 1977," G.12.3 Industrial Production (1977-03-15) : 3-3. https://fraser.stlouisfed.org/title/55/item/59602/toc/470174 , accessed on April 19, 2024.