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-. "September 14, 1984," G.12.3 Industrial Production (1984-09-14) : 13-13. https://fraser.stlouisfed.org/title/55/item/59683/toc/472910 , accessed on April 20, 2024.