Federal Reserve Bank of Chicago. "September 1, 1940, Volume 23, Number 8," Business Conditions (Federal Reserve Bank of Chicago) (September 1, 1940). https://fraser.stlouisfed.org/title/5562/item/539931, accessed on May 21, 2024.
Federal Reserve Bank of Chicago. "September 1, 1940, Volume 23, Number 8," Business Conditions (Federal Reserve Bank of Chicago) (September 1, 1940). https://fraser.stlouisfed.org/title/5562/item/539931, accessed on May 21, 2024.