Federal Reserve Bank of Chicago. "June 30, 1931, Volume 14, Number 7," Business Conditions (Federal Reserve Bank of Chicago) (June 30, 1931). https://fraser.stlouisfed.org/title/5562/item/539821, accessed on April 28, 2024.
Federal Reserve Bank of Chicago. "June 30, 1931, Volume 14, Number 7," Business Conditions (Federal Reserve Bank of Chicago) (June 30, 1931). https://fraser.stlouisfed.org/title/5562/item/539821, accessed on April 28, 2024.