Board of Governors of the Federal Reserve System (U.S.), 1935-. "Explanatory Note," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "June 15, 1983," G.12.3 Industrial Production (1983-06-15) : 20-20. https://fraser.stlouisfed.org/title/55/item/59668/toc/472607 , accessed on April 19, 2024.