Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Net Ton-Miles, Revenue and Nonrevenue," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "December 1919," Federal Reserve Bulletin (December 1919) : 72-72. https://fraser.stlouisfed.org/title/62/item/20596/toc/54765 , accessed on April 24, 2024.