Board of Governors of the Federal Reserve System (U.S.), 1935-. "Charts," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "May 18, 1987," G.3 Capacity Utilization, Manufacturing, Mining, Utilities and Industrial Materials (1987-05-18) : 2-2. https://fraser.stlouisfed.org/title/51/item/56866/toc/448379 , accessed on April 19, 2024.