Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Index Number of Ocean Freight Rates," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "August 1921," Federal Reserve Bulletin (August 1921) : 41-44. https://fraser.stlouisfed.org/title/62/item/20526/toc/100304 , accessed on April 17, 2024.