Federal Reserve Bank of Chicago. "July 1967," Business Conditions (Federal Reserve Bank of Chicago) (July 1967). https://fraser.stlouisfed.org/title/5562/item/540253, accessed on April 19, 2024.
Federal Reserve Bank of Chicago. "July 1967," Business Conditions (Federal Reserve Bank of Chicago) (July 1967). https://fraser.stlouisfed.org/title/5562/item/540253, accessed on April 19, 2024.