Board of Governors of the Federal Reserve System (U.S.), 1935-. "Subtotals and Individual Series, 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) : 6-8. https://fraser.stlouisfed.org/title/55/item/59583/toc/468221 , accessed on May 1, 2024.