Board of Governors of the Federal Reserve System (U.S.), 1935-. "Gross Value of Product, Billions of Dollars at Annual Rates, Monthly," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "1987 Revision," G.12.3 Industrial Production (1987-01-01) : 24-24. https://fraser.stlouisfed.org/title/55/item/59714/toc/492571 , accessed on April 19, 2024.