Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Index Numbers of Wholesale Prices (All Commodities)," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "April 1920," Federal Reserve Bulletin (April 1920) : 54-54. https://fraser.stlouisfed.org/title/62/item/20600/toc/75851 , accessed on May 7, 2024.