Federal Reserve Bank of Chicago. "December 1961," Business Conditions (Federal Reserve Bank of Chicago) (December 1961). https://fraser.stlouisfed.org/title/5562/item/540186, accessed on April 25, 2024.
Federal Reserve Bank of Chicago. "December 1961," Business Conditions (Federal Reserve Bank of Chicago) (December 1961). https://fraser.stlouisfed.org/title/5562/item/540186, accessed on April 25, 2024.