Federal Reserve Bank of Chicago. "August 1968," Business Conditions (Federal Reserve Bank of Chicago) (August 1968). https://fraser.stlouisfed.org/title/5562/item/540266, accessed on April 25, 2024.
Federal Reserve Bank of Chicago. "August 1968," Business Conditions (Federal Reserve Bank of Chicago) (August 1968). https://fraser.stlouisfed.org/title/5562/item/540266, accessed on April 25, 2024.