Federal Reserve Bank of Chicago. "March 1970," Business Conditions (Federal Reserve Bank of Chicago) (March 1970). https://fraser.stlouisfed.org/title/5562/item/540285, accessed on April 28, 2024.
Federal Reserve Bank of Chicago. "March 1970," Business Conditions (Federal Reserve Bank of Chicago) (March 1970). https://fraser.stlouisfed.org/title/5562/item/540285, accessed on April 28, 2024.