Federal Reserve Bank of Chicago. "July 31, 1930, Volume 13, Number 8," Business Conditions (Federal Reserve Bank of Chicago) (July 31, 1930). https://fraser.stlouisfed.org/title/5562/item/574535, accessed on May 3, 2024.
Federal Reserve Bank of Chicago. "July 31, 1930, Volume 13, Number 8," Business Conditions (Federal Reserve Bank of Chicago) (July 31, 1930). https://fraser.stlouisfed.org/title/5562/item/574535, accessed on May 3, 2024.