Federal Reserve Bank of Chicago. "July 1, 1940, Volume 23, Number 6," Business Conditions (Federal Reserve Bank of Chicago) (July 1, 1940). https://fraser.stlouisfed.org/title/5562/item/539929, accessed on April 17, 2024.
Federal Reserve Bank of Chicago. "July 1, 1940, Volume 23, Number 6," Business Conditions (Federal Reserve Bank of Chicago) (July 1, 1940). https://fraser.stlouisfed.org/title/5562/item/539929, accessed on April 17, 2024.