Federal Reserve Bank of Chicago. "November 1971," Business Conditions (Federal Reserve Bank of Chicago) (November 1971). https://fraser.stlouisfed.org/title/5562/item/540305, accessed on May 2, 2024.
Federal Reserve Bank of Chicago. "November 1971," Business Conditions (Federal Reserve Bank of Chicago) (November 1971). https://fraser.stlouisfed.org/title/5562/item/540305, accessed on May 2, 2024.