Board of Governors of the Federal Reserve System (U.S.), 1935-. "Seasonally Adjusted and Unadjusted Summary," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "May 17, 1972 : Errata," G.12.3 Industrial Production (1972-05-17) : 1-1. https://fraser.stlouisfed.org/title/55/item/59735/toc/469935 , accessed on April 18, 2024.