Board of Governors of the Federal Reserve System (U.S.), 1935-. "Seasonally Adjusted Indexes," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "December 15, 1978," G.12.3 Industrial Production (1978-12-15) : 16-16. https://fraser.stlouisfed.org/title/55/item/59783/toc/470511 , accessed on March 28, 2024.