Federal Reserve Bank of Chicago. "December 1972," Business Conditions (Federal Reserve Bank of Chicago) (December 1972). https://fraser.stlouisfed.org/title/5562/item/540318, accessed on May 1, 2024.
Federal Reserve Bank of Chicago. "December 1972," Business Conditions (Federal Reserve Bank of Chicago) (December 1972). https://fraser.stlouisfed.org/title/5562/item/540318, accessed on May 1, 2024.