Federal Reserve Bank of Chicago. "December 1960," Business Conditions (Federal Reserve Bank of Chicago) (December 1960). https://fraser.stlouisfed.org/title/5562/item/540174, accessed on April 30, 2024.
Federal Reserve Bank of Chicago. "December 1960," Business Conditions (Federal Reserve Bank of Chicago) (December 1960). https://fraser.stlouisfed.org/title/5562/item/540174, accessed on April 30, 2024.