Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Nonfinancial Business Activity - Selected Measures," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "June 1990," Federal Reserve Bulletin (June 1990) : 113-113. https://fraser.stlouisfed.org/title/62/item/20816/toc/216664 , accessed on May 4, 2024.