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 16, 1987," G.12.3 Industrial Production (1987-01-16) : 13-13. https://fraser.stlouisfed.org/title/55/item/59715/toc/473723 , accessed on May 2, 2024.