Board of Governors of the Federal Reserve System (U.S.), 1935-. "Industry Subtotals and Individual Series, Not Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "April 15, 1988," G.12.3 Industrial Production (1988-04-15) : 11-11. https://fraser.stlouisfed.org/title/55/item/59776/toc/474314 , accessed on May 2, 2024.