Federal Reserve Bank of Chicago. "April 1959," Business Conditions (Federal Reserve Bank of Chicago) (April 1959). https://fraser.stlouisfed.org/title/5562/item/540154, accessed on April 19, 2024.
Federal Reserve Bank of Chicago. "April 1959," Business Conditions (Federal Reserve Bank of Chicago) (April 1959). https://fraser.stlouisfed.org/title/5562/item/540154, accessed on April 19, 2024.