Board of Governors of the Federal Reserve System (U.S.), 1935-. "Gross Values in Billions of 1972 Dollars, Annual Rates, by Month," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "Industrial Production Indexes 1980," G.12.3 Industrial Production (1981-09-01) : 12-12. https://fraser.stlouisfed.org/title/55/item/59611/toc/492560 , accessed on May 1, 2024.