Federal Reserve Bank of Chicago. "May 1972," Business Conditions (Federal Reserve Bank of Chicago) (May 1972). https://fraser.stlouisfed.org/title/5562/item/540311, accessed on May 11, 2024.
Federal Reserve Bank of Chicago. "May 1972," Business Conditions (Federal Reserve Bank of Chicago) (May 1972). https://fraser.stlouisfed.org/title/5562/item/540311, accessed on May 11, 2024.