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-. "February 13, 1976," G.12.3 Industrial Production (1976-02-13) : 3-3. https://fraser.stlouisfed.org/title/55/item/59531/toc/470063 , accessed on May 2, 2024.