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. "March 1991," Federal Reserve Bulletin (March 1991) : 92-92. https://fraser.stlouisfed.org/title/62/item/20826/toc/236192 , accessed on April 19, 2024.