Federal Reserve Bank of Chicago. "August 1967," Business Conditions (Federal Reserve Bank of Chicago) (August 1967). https://fraser.stlouisfed.org/title/5562/item/540254, accessed on March 28, 2024.
Federal Reserve Bank of Chicago. "August 1967," Business Conditions (Federal Reserve Bank of Chicago) (August 1967). https://fraser.stlouisfed.org/title/5562/item/540254, accessed on March 28, 2024.