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. "January 1981," Federal Reserve Bulletin (January 1981) : 144-144. https://fraser.stlouisfed.org/title/62/item/20473/toc/333258 , accessed on April 28, 2024.