Federal Reserve Bank of Chicago. "June 1939, Volume 22, Number 6," Business Conditions (Federal Reserve Bank of Chicago) (June 1939). https://fraser.stlouisfed.org/title/5562/item/539917, accessed on April 23, 2024.
Federal Reserve Bank of Chicago. "June 1939, Volume 22, Number 6," Business Conditions (Federal Reserve Bank of Chicago) (June 1939). https://fraser.stlouisfed.org/title/5562/item/539917, accessed on April 23, 2024.