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-. "March 15, 1983," G.12.3 Industrial Production (1983-03-15) : 14-14. https://fraser.stlouisfed.org/title/55/item/59665/toc/472554 , accessed on March 28, 2024.