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-. "October 14, 1977," G.12.3 Industrial Production (1977-10-14) : 14-14. https://fraser.stlouisfed.org/title/55/item/59788/toc/470260 , accessed on March 28, 2024.