Federal Reserve Bank of Chicago. "April 1963," Business Conditions (Federal Reserve Bank of Chicago) (April 1963). https://fraser.stlouisfed.org/title/5562/item/540202, accessed on March 28, 2024.
Federal Reserve Bank of Chicago. "April 1963," Business Conditions (Federal Reserve Bank of Chicago) (April 1963). https://fraser.stlouisfed.org/title/5562/item/540202, accessed on March 28, 2024.