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, 1973," G.12.3 Industrial Production (1973-09-14) : 3-3. https://fraser.stlouisfed.org/title/55/item/59595/toc/471448 , accessed on March 28, 2024.