Board of Governors of the Federal Reserve System (U.S.), 1935-. "Utilization of Capacity (in Per Cent)," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "July 20, 1967," G.3 Capacity Utilization, Manufacturing, Mining, Utilities and Industrial Materials (1967-07-20) : 3-3. https://fraser.stlouisfed.org/title/51/item/56870/toc/447620 , accessed on April 24, 2024.