Federal Reserve Bank of Chicago. "May 1960," Business Conditions (Federal Reserve Bank of Chicago) (May 1960). https://fraser.stlouisfed.org/title/5562/item/540167, accessed on April 25, 2024.
Federal Reserve Bank of Chicago. "May 1960," Business Conditions (Federal Reserve Bank of Chicago) (May 1960). https://fraser.stlouisfed.org/title/5562/item/540167, accessed on April 25, 2024.