Board of Governors of the Federal Reserve System (U.S.), 1935-. "Diffusion Indexes of Industrial Production," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "July 15, 1991," G.17 Industrial Production and Capacity Utilization (1991-07-15) : 15-15. https://fraser.stlouisfed.org/title/77/item/63592/toc/454831 , accessed on May 5, 2024.