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-. "August 16, 1971," G.12.3 Industrial Production (1971-08-16) : 8-8. https://fraser.stlouisfed.org/title/55/item/59793/toc/468223 , accessed on May 7, 2024.