Federal Reserve Bank of Chicago. "June 30, 1930, Volume 13, Number 7," Business Conditions (Federal Reserve Bank of Chicago) (June 30, 1930). https://fraser.stlouisfed.org/title/5562/item/574534, accessed on March 28, 2024.
Federal Reserve Bank of Chicago. "June 30, 1930, Volume 13, Number 7," Business Conditions (Federal Reserve Bank of Chicago) (June 30, 1930). https://fraser.stlouisfed.org/title/5562/item/574534, accessed on March 28, 2024.