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-. "May 13, 1983," G.12.3 Industrial Production (1983-05-13) : 14-14. https://fraser.stlouisfed.org/title/55/item/59667/toc/472593 , accessed on April 19, 2024.