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-. "April 13, 1984," G.12.3 Industrial Production (1984-04-13) : 13-13. https://fraser.stlouisfed.org/title/55/item/59678/toc/472811 , accessed on April 23, 2024.