Federal Reserve Bank of Chicago. "October 1, 1940, Volume 23, Number 9," Business Conditions (Federal Reserve Bank of Chicago) (October 1, 1940). https://fraser.stlouisfed.org/title/5562/item/539932, accessed on May 2, 2024.
Federal Reserve Bank of Chicago. "October 1, 1940, Volume 23, Number 9," Business Conditions (Federal Reserve Bank of Chicago) (October 1, 1940). https://fraser.stlouisfed.org/title/5562/item/539932, accessed on May 2, 2024.