Federal Reserve Bank of Chicago. "June 30, 1921," Business Conditions (Federal Reserve Bank of Chicago) (June 30, 1921). https://fraser.stlouisfed.org/title/5562/item/574426, accessed on May 3, 2024.
Federal Reserve Bank of Chicago. "June 30, 1921," Business Conditions (Federal Reserve Bank of Chicago) (June 30, 1921). https://fraser.stlouisfed.org/title/5562/item/574426, accessed on May 3, 2024.