Board of Governors of the Federal Reserve System (U.S.), 1935-. "Selected Measures of Nonfinancial Business Activity," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "1974-1978," Annual Statistical Digest (January 1980) : 189-191. https://fraser.stlouisfed.org/title/7/item/23505/toc/133579 , accessed on April 18, 2024.