Federal Reserve Bank of Chicago. "December 1966," Business Conditions (Federal Reserve Bank of Chicago) (December 1966). https://fraser.stlouisfed.org/title/5562/item/540246, accessed on April 19, 2024.
Federal Reserve Bank of Chicago. "December 1966," Business Conditions (Federal Reserve Bank of Chicago) (December 1966). https://fraser.stlouisfed.org/title/5562/item/540246, accessed on April 19, 2024.