Federal Reserve Bank of Chicago. "December 31, 1931, Volume 15, Number 1," Business Conditions (Federal Reserve Bank of Chicago) (December 31, 1931). https://fraser.stlouisfed.org/title/5562/item/539827, accessed on March 28, 2024.
Federal Reserve Bank of Chicago. "December 31, 1931, Volume 15, Number 1," Business Conditions (Federal Reserve Bank of Chicago) (December 31, 1931). https://fraser.stlouisfed.org/title/5562/item/539827, accessed on March 28, 2024.