Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Industrial Production - Indexes and Gross Value," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "May 1980," Federal Reserve Bulletin (May 1980) : 127-128. https://fraser.stlouisfed.org/title/62/item/20465/toc/105381 , accessed on April 17, 2024.