Board of Governors of the Federal Reserve System (U.S.), 1935-. "Industry Groupings, Not Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "March 16, 1979," G.12.3 Industrial Production (1979-03-16) : 6-6. https://fraser.stlouisfed.org/title/55/item/59617/toc/470561 , accessed on April 25, 2024.