Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Total Nonfarm Business Expenditures on New Plant and Equipment," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "May 1981," Federal Reserve Bulletin (May 1981) : 111-111. https://fraser.stlouisfed.org/title/62/item/20477/toc/104821 , accessed on July 5, 2024.