Federal Reserve Bank of Chicago. "April 30, 1931, Volume 14, Number 5," Business Conditions (Federal Reserve Bank of Chicago) (April 30, 1931). https://fraser.stlouisfed.org/title/5562/item/539819, accessed on April 19, 2024.
Federal Reserve Bank of Chicago. "April 30, 1931, Volume 14, Number 5," Business Conditions (Federal Reserve Bank of Chicago) (April 30, 1931). https://fraser.stlouisfed.org/title/5562/item/539819, accessed on April 19, 2024.