Federal Reserve Bank of Chicago. "June 1960," Business Conditions (Federal Reserve Bank of Chicago) (June 1960). https://fraser.stlouisfed.org/title/5562/item/540168, accessed on April 19, 2024.
Federal Reserve Bank of Chicago. "June 1960," Business Conditions (Federal Reserve Bank of Chicago) (June 1960). https://fraser.stlouisfed.org/title/5562/item/540168, accessed on April 19, 2024.