Federal Reserve Bank of Chicago. "January 1969," Business Conditions (Federal Reserve Bank of Chicago) (January 1969). https://fraser.stlouisfed.org/title/5562/item/540271, accessed on April 30, 2024.
Federal Reserve Bank of Chicago. "January 1969," Business Conditions (Federal Reserve Bank of Chicago) (January 1969). https://fraser.stlouisfed.org/title/5562/item/540271, accessed on April 30, 2024.