Federal Reserve Bank of Chicago. "July 1957," Business Conditions (Federal Reserve Bank of Chicago) (July 1957). https://fraser.stlouisfed.org/title/5562/item/540133, accessed on April 18, 2024.
Federal Reserve Bank of Chicago. "July 1957," Business Conditions (Federal Reserve Bank of Chicago) (July 1957). https://fraser.stlouisfed.org/title/5562/item/540133, accessed on April 18, 2024.