Board of Governors of the Federal Reserve System (U.S.), 1935-. "Market Groupings, Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "July 15, 1987," G.12.3 Industrial Production (1987-07-15) : 4-4. https://fraser.stlouisfed.org/title/55/item/59721/toc/473846 , accessed on April 23, 2024.