Federal Reserve Bank of Chicago. "December 31, 1930, Volume 14, Number 1," Business Conditions (Federal Reserve Bank of Chicago) (December 31, 1930). https://fraser.stlouisfed.org/title/5562/item/574540, accessed on May 11, 2024.
Federal Reserve Bank of Chicago. "December 31, 1930, Volume 14, Number 1," Business Conditions (Federal Reserve Bank of Chicago) (December 31, 1930). https://fraser.stlouisfed.org/title/5562/item/574540, accessed on May 11, 2024.