Board of Governors of the Federal Reserve System (U.S.), 1935-. "Industry Subtotals and Individual Series, Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "July 15, 1981," G.12.3 Industrial Production (1981-07-15) : 12-12. https://fraser.stlouisfed.org/title/55/item/59644/toc/472191 , accessed on April 23, 2024.