Federal Reserve Bank of Chicago. "December 1939, Volume 22, Number 12," Business Conditions (Federal Reserve Bank of Chicago) (December 1939). https://fraser.stlouisfed.org/title/5562/item/539923, accessed on April 28, 2024.
Federal Reserve Bank of Chicago. "December 1939, Volume 22, Number 12," Business Conditions (Federal Reserve Bank of Chicago) (December 1939). https://fraser.stlouisfed.org/title/5562/item/539923, accessed on April 28, 2024.