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. "September 1920," Federal Reserve Bulletin (September 1920) : 83-83. https://fraser.stlouisfed.org/title/62/item/20605/toc/366480 , accessed on July 16, 2024.