Board of Governors of the Federal Reserve System (U.S.), 1935-. "Charts," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "July 18, 1988," G.3 Capacity Utilization, Manufacturing, Mining, Utilities and Industrial Materials (1988-07-18) : 2-2. https://fraser.stlouisfed.org/title/51/item/56720/toc/448432 , accessed on April 25, 2024.