Federal Reserve Bank of Chicago. "June 1, 1928, Volume 11, Number 6," Business Conditions (Federal Reserve Bank of Chicago) (June 1, 1928). https://fraser.stlouisfed.org/title/5562/item/574510, accessed on April 18, 2024.
Federal Reserve Bank of Chicago. "June 1, 1928, Volume 11, Number 6," Business Conditions (Federal Reserve Bank of Chicago) (June 1, 1928). https://fraser.stlouisfed.org/title/5562/item/574510, accessed on April 18, 2024.