Federal Reserve Bank of Chicago. "February 28, 1931, Volume 14, Number 3," Business Conditions (Federal Reserve Bank of Chicago) (February 28, 1931). https://fraser.stlouisfed.org/title/5562/item/539817, accessed on April 23, 2024.
Federal Reserve Bank of Chicago. "February 28, 1931, Volume 14, Number 3," Business Conditions (Federal Reserve Bank of Chicago) (February 28, 1931). https://fraser.stlouisfed.org/title/5562/item/539817, accessed on April 23, 2024.