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, 1978," G.12.3 Industrial Production (1978-06-15) : 18-18. https://fraser.stlouisfed.org/title/55/item/59785/toc/470400 , accessed on March 29, 2024.