Federal Reserve Bank of Chicago. "August 1, 1940, Volume 23, Number 7," Business Conditions (Federal Reserve Bank of Chicago) (August 1, 1940). https://fraser.stlouisfed.org/title/5562/item/539930, accessed on May 1, 2024.
Federal Reserve Bank of Chicago. "August 1, 1940, Volume 23, Number 7," Business Conditions (Federal Reserve Bank of Chicago) (August 1, 1940). https://fraser.stlouisfed.org/title/5562/item/539930, accessed on May 1, 2024.