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-. "May 14, 1993," G.17 Industrial Production and Capacity Utilization (1993-05-14) : 15-15. https://fraser.stlouisfed.org/title/77/item/63615/toc/455207 , accessed on April 18, 2024.