Board of Governors of the Federal Reserve System (U.S.), 1935-. "Diffusion Indexes," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "July 15, 1983," G.12.3 Industrial Production (1983-07-15) : 15-15. https://fraser.stlouisfed.org/title/55/item/59669/toc/472625 , accessed on April 25, 2024.