Board of Governors of the Federal Reserve System (U.S.), 1935-. "Industry Groupings, Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "May 16, 1988," G.12.3 Industrial Production (1988-05-16) : 6-6. https://fraser.stlouisfed.org/title/55/item/59734/toc/474318 , accessed on March 29, 2024.