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) : 10-10. https://fraser.stlouisfed.org/title/55/item/59644/toc/472193 , accessed on March 28, 2024.