Federal Reserve Bank of Chicago. "July 1968," Business Conditions (Federal Reserve Bank of Chicago) (July 1968). https://fraser.stlouisfed.org/title/5562/item/540265, accessed on April 25, 2024.
Federal Reserve Bank of Chicago. "July 1968," Business Conditions (Federal Reserve Bank of Chicago) (July 1968). https://fraser.stlouisfed.org/title/5562/item/540265, accessed on April 25, 2024.