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, 1987," G.12.3 Industrial Production (1987-04-15) : 8-8. https://fraser.stlouisfed.org/title/55/item/59718/toc/473784 , accessed on April 23, 2024.