Board of Governors of the Federal Reserve System (U.S.), 1935-. "Summary Groupings, Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "January 17, 1990," G.12.3 Industrial Production (1990-01-17) : 14-14. https://fraser.stlouisfed.org/title/55/item/59756/toc/450967 , accessed on April 25, 2024.