Board of Governors of the Federal Reserve System (U.S.), 1935-. "Industry Subtotals and Individual Series, Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "December 15, 1989," G.12.3 Industrial Production (1989-12-15) : 10-10. https://fraser.stlouisfed.org/title/55/item/59755/toc/474677 , accessed on May 9, 2024.