Board of Governors of the Federal Reserve System (U.S.), 1935-. "Business Expenditures on New Plant and Equipment," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "1970-1979," Annual Statistical Digest (March 1981) : 270-271. https://fraser.stlouisfed.org/title/7/item/23506/toc/190720 , accessed on June 21, 2024.