Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Output, Capacity, and Capacity Utilization," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "April 1981," Federal Reserve Bulletin (April 1981) : 166-167. https://fraser.stlouisfed.org/title/62/item/20476/toc/385467 , accessed on April 17, 2024.