Federal Reserve Bank of Chicago. "March 31, 1930, Volume 13, Number 4," Business Conditions (Federal Reserve Bank of Chicago) (March 31, 1930). https://fraser.stlouisfed.org/title/5562/item/574531, accessed on April 18, 2024.
Federal Reserve Bank of Chicago. "March 31, 1930, Volume 13, Number 4," Business Conditions (Federal Reserve Bank of Chicago) (March 31, 1930). https://fraser.stlouisfed.org/title/5562/item/574531, accessed on April 18, 2024.