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. "April 1964," Federal Reserve Bulletin (April 1964) : 84-84. https://fraser.stlouisfed.org/title/62/item/21352/toc/415089 , accessed on May 4, 2024.