Board of Governors of the Federal Reserve System (U.S.), 1935-. "Summary Groupings, Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "October 16, 1980," G.12.3 Industrial Production (1980-10-16) : 13-13. https://fraser.stlouisfed.org/title/55/item/59637/toc/472058 , accessed on April 26, 2024.