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 13, 1985," G.12.3 Industrial Production (1985-09-13) : 13-13. https://fraser.stlouisfed.org/title/55/item/59696/toc/473120 , accessed on May 4, 2024.