Federal Reserve Bank of Chicago. "November 1967," Business Conditions (Federal Reserve Bank of Chicago) (November 1967). https://fraser.stlouisfed.org/title/5562/item/540257, accessed on May 2, 2024.
Federal Reserve Bank of Chicago. "November 1967," Business Conditions (Federal Reserve Bank of Chicago) (November 1967). https://fraser.stlouisfed.org/title/5562/item/540257, accessed on May 2, 2024.