Federal Reserve Bank of Chicago. "October 1957," Business Conditions (Federal Reserve Bank of Chicago) (October 1957). https://fraser.stlouisfed.org/title/5562/item/540136, accessed on May 1, 2024.
Federal Reserve Bank of Chicago. "October 1957," Business Conditions (Federal Reserve Bank of Chicago) (October 1957). https://fraser.stlouisfed.org/title/5562/item/540136, accessed on May 1, 2024.