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. "March 1992," Federal Reserve Bulletin (March 1992) : 99-99. https://fraser.stlouisfed.org/title/62/item/20838/toc/196719 , accessed on May 11, 2024.