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-. "January 14, 1983," G.12.3 Industrial Production (1983-01-14) : 14-14. https://fraser.stlouisfed.org/title/55/item/59663/toc/472512 , accessed on May 2, 2024.