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-. "April 15, 1981," G.12.3 Industrial Production (1981-04-15) : 18-18. https://fraser.stlouisfed.org/title/55/item/59643/toc/472171 , accessed on March 28, 2024.