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-. "June 13, 1980," G.12.3 Industrial Production (1980-06-13) : 14-14. https://fraser.stlouisfed.org/title/55/item/59632/toc/471980 , accessed on April 26, 2024.