Federal Reserve Bank of Chicago. "January 1970," Business Conditions (Federal Reserve Bank of Chicago) (January 1970). https://fraser.stlouisfed.org/title/5562/item/540283, accessed on April 26, 2024.
Federal Reserve Bank of Chicago. "January 1970," Business Conditions (Federal Reserve Bank of Chicago) (January 1970). https://fraser.stlouisfed.org/title/5562/item/540283, accessed on April 26, 2024.