Federal Reserve Bank of Chicago. "October 1939, Volume 22, Number 10," Business Conditions (Federal Reserve Bank of Chicago) (October 1939). https://fraser.stlouisfed.org/title/5562/item/539921, accessed on March 28, 2024.
Federal Reserve Bank of Chicago. "October 1939, Volume 22, Number 10," Business Conditions (Federal Reserve Bank of Chicago) (October 1939). https://fraser.stlouisfed.org/title/5562/item/539921, accessed on March 28, 2024.