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-. "March 13, 1987," G.12.3 Industrial Production (1987-03-13) : 6-6. https://fraser.stlouisfed.org/title/55/item/59717/toc/473761 , accessed on March 29, 2024.