Board of Governors of the Federal Reserve System (U.S.), 1935-. "Industrial Production," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "1970-1979," Annual Statistical Digest (March 1981) : 342-345. https://fraser.stlouisfed.org/title/7/item/23506/toc/190731 , accessed on June 21, 2024.