Federal Reserve Bank of Chicago. "July 1966," Business Conditions (Federal Reserve Bank of Chicago) (July 1966). https://fraser.stlouisfed.org/title/5562/item/540241, accessed on May 11, 2024.
Federal Reserve Bank of Chicago. "July 1966," Business Conditions (Federal Reserve Bank of Chicago) (July 1966). https://fraser.stlouisfed.org/title/5562/item/540241, accessed on May 11, 2024.