Board of Governors of the Federal Reserve System (U.S.), 1935-. "Charts," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "June 16, 1988," G.3 Capacity Utilization, Manufacturing, Mining, Utilities and Industrial Materials (1988-06-16) : 2-2. https://fraser.stlouisfed.org/title/51/item/56768/toc/448427 , accessed on April 19, 2024.