Federal Reserve Bank of Chicago. "June 1, 1940, Volume 23, Number 5," Business Conditions (Federal Reserve Bank of Chicago) (June 1, 1940). https://fraser.stlouisfed.org/title/5562/item/539928, accessed on April 25, 2024.
Federal Reserve Bank of Chicago. "June 1, 1940, Volume 23, Number 5," Business Conditions (Federal Reserve Bank of Chicago) (June 1, 1940). https://fraser.stlouisfed.org/title/5562/item/539928, accessed on April 25, 2024.