Board of Governors of the Federal Reserve System (U.S.), 1935-. "Not Seasonally Adjusted Indexes," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "June 15, 1979," G.12.3 Industrial Production (1979-06-15) : 17-17. https://fraser.stlouisfed.org/title/55/item/59620/toc/470623 , accessed on April 18, 2024.