Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "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. "December 1956," Federal Reserve Bulletin (December 1956) : 73-73. https://fraser.stlouisfed.org/title/62/item/21264/toc/111730 , accessed on March 19, 2024.