Federal Reserve Bank of Chicago. "May 1966," Business Conditions (Federal Reserve Bank of Chicago) (May 1966). https://fraser.stlouisfed.org/title/5562/item/540239, accessed on May 9, 2024.
Federal Reserve Bank of Chicago. "May 1966," Business Conditions (Federal Reserve Bank of Chicago) (May 1966). https://fraser.stlouisfed.org/title/5562/item/540239, accessed on May 9, 2024.