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-. "November 14, 1980," G.12.3 Industrial Production (1980-11-14) : 13-13. https://fraser.stlouisfed.org/title/55/item/59638/toc/472078 , accessed on May 3, 2024.