Board of Governors of the Federal Reserve System (U.S.), 1935-. "Industry Subtotals and Individual Series, Seasonally Adjusted and Unadjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "February 15, 1972," G.12.3 Industrial Production (1972-02-15) : 4-7. https://fraser.stlouisfed.org/title/55/item/59779/toc/471345 , accessed on April 24, 2024.