Board of Governors of the Federal Reserve System (U.S.), 1935-. "Industrial Electric Power Use - Seasonally Adjusted Indexes," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "September 15, 1978," G.12.3 Industrial Production (1978-09-15) : 14-14. https://fraser.stlouisfed.org/title/55/item/59614/toc/470451 , accessed on April 29, 2024.