Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Selected Business Indexes," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "August 1966," Federal Reserve Bulletin (August 1966) : 156-156. https://fraser.stlouisfed.org/title/62/item/21380/toc/167542 , accessed on April 25, 2024.