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-. "August 14, 1987," G.12.3 Industrial Production (1987-08-14) : 7-7. https://fraser.stlouisfed.org/title/55/item/59722/toc/473852 , accessed on April 28, 2024.