Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Freight Car Loadings: Seasonal Adjustment Factors," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "June 1937," Federal Reserve Bulletin (June 1937) : 28-29. https://fraser.stlouisfed.org/title/62/item/20743/toc/302974 , accessed on May 4, 2024.