Board of Governors of the Federal Reserve System (U.S.), 1935-. "Explanatory Note," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "August 14, 1997," G.17 Industrial Production and Capacity Utilization (1997-08-14) : 18-18. https://fraser.stlouisfed.org/title/77/item/63669/toc/455910 , accessed on April 23, 2024.