Board of Governors of the Federal Reserve System (U.S.), 1935-. "Electric Power Use by Industries, Seasonally Adjusted Indexes," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "July 15, 1987," G.12.3 Industrial Production (1987-07-15) : 18-18. https://fraser.stlouisfed.org/title/55/item/59721/toc/473834 , accessed on April 19, 2024.