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-. "January 15, 1981," G.12.3 Industrial Production (1981-01-15) : 7-7. https://fraser.stlouisfed.org/title/55/item/59640/toc/472115 , accessed on May 4, 2024.