Federal Reserve Bank of Chicago. "January 1961," Business Conditions (Federal Reserve Bank of Chicago) (January 1961). https://fraser.stlouisfed.org/title/5562/item/540175, accessed on April 23, 2024.
Federal Reserve Bank of Chicago. "January 1961," Business Conditions (Federal Reserve Bank of Chicago) (January 1961). https://fraser.stlouisfed.org/title/5562/item/540175, accessed on April 23, 2024.