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 1976," G.12.3 Industrial Production (1977-09-01) : 12-12. https://fraser.stlouisfed.org/title/55/item/59789/toc/492480 , accessed on May 2, 2024.