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 1991," Federal Reserve Bulletin (May 1991) : 123-123. https://fraser.stlouisfed.org/title/62/item/20828/toc/127922 , accessed on May 10, 2024.