Federal Reserve Bank of Chicago. "May 31, 1930, Volume 13, Number 6," Business Conditions (Federal Reserve Bank of Chicago) (May 31, 1930). https://fraser.stlouisfed.org/title/5562/item/574533, accessed on April 24, 2024.
Federal Reserve Bank of Chicago. "May 31, 1930, Volume 13, Number 6," Business Conditions (Federal Reserve Bank of Chicago) (May 31, 1930). https://fraser.stlouisfed.org/title/5562/item/574533, accessed on April 24, 2024.