Federal Reserve Bank of Chicago. "June 1966," Business Conditions (Federal Reserve Bank of Chicago) (June 1966). https://fraser.stlouisfed.org/title/5562/item/540240, accessed on May 3, 2024.
Federal Reserve Bank of Chicago. "June 1966," Business Conditions (Federal Reserve Bank of Chicago) (June 1966). https://fraser.stlouisfed.org/title/5562/item/540240, accessed on May 3, 2024.