Federal Reserve Bank of Chicago. "May 31, 1931, Volume 14, Number 6," Business Conditions (Federal Reserve Bank of Chicago) (May 31, 1931). https://fraser.stlouisfed.org/title/5562/item/539820, accessed on March 29, 2024.
Federal Reserve Bank of Chicago. "May 31, 1931, Volume 14, Number 6," Business Conditions (Federal Reserve Bank of Chicago) (May 31, 1931). https://fraser.stlouisfed.org/title/5562/item/539820, accessed on March 29, 2024.