Board of Governors of the Federal Reserve System (U.S.), 1935-. "Total Nonfarm Business Expenditures on New Plant and Equipment," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "1990," Annual Statistical Digest (November 1991) : 64-64. https://fraser.stlouisfed.org/title/7/item/23496/toc/252105 , accessed on April 25, 2024.