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 15, 1976," G.12.3 Industrial Production (1976-10-15) : 9-9. https://fraser.stlouisfed.org/title/55/item/59521/toc/470125 , accessed on March 29, 2024.