Board of Governors of the Federal Reserve System (U.S.), 1935-. "February 15, 1968," G.12.3 Industrial Production (1968-02-15). https://fraser.stlouisfed.org/title/55/item/494030, accessed on April 19, 2024.
Board of Governors of the Federal Reserve System (U.S.), 1935-. "February 15, 1968," G.12.3 Industrial Production (1968-02-15). https://fraser.stlouisfed.org/title/55/item/494030, accessed on April 19, 2024.