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-. "October 16, 1986," G.12.3 Industrial Production (1986-10-16) : 13-13. https://fraser.stlouisfed.org/title/55/item/59711/toc/473369 , accessed on April 25, 2024.