Federal Reserve Bank of Chicago. "January 31, 1931, Volume 14, Number 2," Business Conditions (Federal Reserve Bank of Chicago) (January 31, 1931). https://fraser.stlouisfed.org/title/5562/item/539816, accessed on April 28, 2024.
Federal Reserve Bank of Chicago. "January 31, 1931, Volume 14, Number 2," Business Conditions (Federal Reserve Bank of Chicago) (January 31, 1931). https://fraser.stlouisfed.org/title/5562/item/539816, accessed on April 28, 2024.