Board of Governors of the Federal Reserve System (U.S.), 1935-. "September 15, 1967," G.12.3 Industrial Production (1967-09-15). https://fraser.stlouisfed.org/title/55/item/494025, accessed on April 25, 2024.
Board of Governors of the Federal Reserve System (U.S.), 1935-. "September 15, 1967," G.12.3 Industrial Production (1967-09-15). https://fraser.stlouisfed.org/title/55/item/494025, accessed on April 25, 2024.