Board of Governors of the Federal Reserve System (U.S.), 1935-. "April 14, 1967," G.12.3 Industrial Production (1967-04-14). https://fraser.stlouisfed.org/title/55/item/494020, accessed on April 18, 2024.
Board of Governors of the Federal Reserve System (U.S.), 1935-. "April 14, 1967," G.12.3 Industrial Production (1967-04-14). https://fraser.stlouisfed.org/title/55/item/494020, accessed on April 18, 2024.