Federal Reserve Bank of Philadelphia. "June 1968," Business Review (Federal Reserve Bank of Philadelphia) (June 1968). https://fraser.stlouisfed.org/title/5580/item/557477, accessed on April 24, 2024.
Federal Reserve Bank of Philadelphia. "June 1968," Business Review (Federal Reserve Bank of Philadelphia) (June 1968). https://fraser.stlouisfed.org/title/5580/item/557477, accessed on April 24, 2024.