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-. "March 14, 1997," G.17 Industrial Production and Capacity Utilization (1997-03-14) : 15-15. https://fraser.stlouisfed.org/title/77/item/63664/toc/455843 , accessed on March 28, 2024.