Board of Governors of the Federal Reserve System (U.S.), 1935-. "Industry Groupings, Not Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "September 15, 1987," G.12.3 Industrial Production (1987-09-15) : 7-7. https://fraser.stlouisfed.org/title/55/item/59723/toc/473876 , accessed on May 6, 2024.