Federal Reserve Bank of Chicago. "October 1961," Business Conditions (Federal Reserve Bank of Chicago) (October 1961). https://fraser.stlouisfed.org/title/5562/item/540184, accessed on March 29, 2024.
Federal Reserve Bank of Chicago. "October 1961," Business Conditions (Federal Reserve Bank of Chicago) (October 1961). https://fraser.stlouisfed.org/title/5562/item/540184, accessed on March 29, 2024.