Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Revenues, Expenses, and Income of Class I Railroads," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "July 1951," Federal Reserve Bulletin (July 1951) : 124-124. https://fraser.stlouisfed.org/title/62/item/21199/toc/110339 , accessed on March 29, 2024.