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 14, 1989," G.12.3 Industrial Production (1989-04-14) : 9-9. https://fraser.stlouisfed.org/title/55/item/59747/toc/474532 , accessed on April 19, 2024.