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-. "December 13, 1985," G.12.3 Industrial Production (1985-12-13) : 13-13. https://fraser.stlouisfed.org/title/55/item/59699/toc/473173 , accessed on April 19, 2024.