Federal Reserve Bank of Philadelphia. "July 1968," Business Review (Federal Reserve Bank of Philadelphia) (July 1968). https://fraser.stlouisfed.org/title/5580/item/557478, accessed on April 26, 2024.
Federal Reserve Bank of Philadelphia. "July 1968," Business Review (Federal Reserve Bank of Philadelphia) (July 1968). https://fraser.stlouisfed.org/title/5580/item/557478, accessed on April 26, 2024.