Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Industry Groupings, Not Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "March 1966," Federal Reserve Bulletin (March 1966) : 102-102. https://fraser.stlouisfed.org/title/62/item/21375/toc/380687 , accessed on March 29, 2024.