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. "December 1979," Federal Reserve Bulletin (December 1979) : 128-129. https://fraser.stlouisfed.org/title/62/item/20460/toc/129787 , accessed on April 19, 2024.