Board of Governors of the Federal Reserve System (U.S.), 1935-. "Market Groupings, Not Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "July 14, 1971," G.12.3 Industrial Production (1971-07-14) : 4-4. https://fraser.stlouisfed.org/title/55/item/59583/toc/468215 , accessed on May 2, 2024.