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-. "March 15, 1972," G.12.3 Industrial Production (1972-03-15) : 4-7. https://fraser.stlouisfed.org/title/55/item/59733/toc/469916 , accessed on April 30, 2024.