Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Board of Trade Index Number - Percentage of Prices," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "March 1921," Federal Reserve Bulletin (March 1921) : 36-36. https://fraser.stlouisfed.org/title/62/item/20521/toc/249227 , accessed on May 4, 2024.