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-. "August 15, 1975," G.12.3 Industrial Production (1975-08-15) : 3-3. https://fraser.stlouisfed.org/title/55/item/59598/toc/470001 , accessed on April 19, 2024.