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-. "April 16, 1997," G.17 Industrial Production and Capacity Utilization (1997-04-16) : 18-18. https://fraser.stlouisfed.org/title/77/item/63665/toc/455860 , accessed on June 14, 2024.