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-. "March 15, 1977," G.12.3 Industrial Production (1977-03-15) : 14-15. https://fraser.stlouisfed.org/title/55/item/59602/toc/470176 , accessed on May 1, 2024.