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 14, 1966," G.12.3 Industrial Production (1966-04-14) : 6-8. https://fraser.stlouisfed.org/title/55/item/59556/toc/487526 , accessed on May 4, 2024.