Federal Reserve Bank of Chicago. "April 30, 1921," Business Conditions (Federal Reserve Bank of Chicago) (April 30, 1921). https://fraser.stlouisfed.org/title/5562/item/574424, accessed on April 23, 2024.
Federal Reserve Bank of Chicago. "April 30, 1921," Business Conditions (Federal Reserve Bank of Chicago) (April 30, 1921). https://fraser.stlouisfed.org/title/5562/item/574424, accessed on April 23, 2024.