Federal Reserve Bank of Chicago. "October 1967," Business Conditions (Federal Reserve Bank of Chicago) (October 1967). https://fraser.stlouisfed.org/title/5562/item/540256, accessed on May 9, 2024.
Federal Reserve Bank of Chicago. "October 1967," Business Conditions (Federal Reserve Bank of Chicago) (October 1967). https://fraser.stlouisfed.org/title/5562/item/540256, accessed on May 9, 2024.