Board of Governors of the Federal Reserve System (U.S.), 1935-. "Industry Subtotals and Individual Series, Not 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) : 13-13. https://fraser.stlouisfed.org/title/55/item/59644/toc/472190 , accessed on May 4, 2024.