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. "April 1959," Federal Reserve Bulletin (April 1959) : 81-81. https://fraser.stlouisfed.org/title/62/item/21292/toc/88229 , accessed on April 19, 2024.