Board of Governors of the Federal Reserve System (U.S.), 1935-. "Output, Capacity, and Capacity Utilization," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "1980," Annual Statistical Digest (November 1981) : 133-133. https://fraser.stlouisfed.org/title/7/item/23507/toc/300819 , accessed on March 28, 2024.