Board of Governors of the Federal Reserve System (U.S.), 1935-. "Market Groupings, Not Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "February 15, 1979," G.12.3 Industrial Production (1979-02-15) : 4-4. https://fraser.stlouisfed.org/title/55/item/59782/toc/470554 , accessed on May 11, 2024.