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. "August 1988," Federal Reserve Bulletin (August 1988) : 123-124. https://fraser.stlouisfed.org/title/62/item/20795/toc/264710 , accessed on April 19, 2024.