Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Average Monthly Wholesale Prices of Commodities," 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) : 64-66. https://fraser.stlouisfed.org/title/62/item/20602/toc/132522 , accessed on March 28, 2024.