Board of Governors of the Federal Reserve System (U.S.), 1935-. "Industry Groupings, Not Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "July 14, 1989," G.12.3 Industrial Production (1989-07-14) : 7-7. https://fraser.stlouisfed.org/title/55/item/59750/toc/474576 , accessed on April 23, 2024.