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-. "September 15, 1989," G.12.3 Industrial Production (1989-09-15) : 18-18. https://fraser.stlouisfed.org/title/55/item/59752/toc/474612 , accessed on April 19, 2024.