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-. "February 16, 1983," G.12.3 Industrial Production (1983-02-16) : 15-15. https://fraser.stlouisfed.org/title/55/item/59664/toc/472542 , accessed on April 28, 2024.