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-. "May 15, 1989," G.12.3 Industrial Production (1989-05-15) : 8-8. https://fraser.stlouisfed.org/title/55/item/59748/toc/474541 , accessed on May 7, 2024.