Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Gross National Product or Expenditure," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "September 1956," Federal Reserve Bulletin (September 1956) : 69-69. https://fraser.stlouisfed.org/title/62/item/21261/toc/365348 , accessed on May 6, 2024.