Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Freight-Car Loadings, by Classes," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "March 1944," Federal Reserve Bulletin (March 1944) : 67-67. https://fraser.stlouisfed.org/title/62/item/21067/toc/384583 , accessed on April 18, 2024.