Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Average Number of Vessels Kept Waiting for Berths each Month," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "June 1920," Federal Reserve Bulletin (June 1920) : 69-69. https://fraser.stlouisfed.org/title/62/item/20602/toc/132527 , accessed on May 3, 2024.