Board of Governors of the Federal Reserve System (U.S.), 1935-. "Subtotals and Individual Series, Not Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "April 15, 1964," G.12.3 Industrial Production (1964-04-15) : 6-8. https://fraser.stlouisfed.org/title/55/item/59526/toc/486188 , accessed on April 19, 2024.