Federal Reserve Bank of Philadelphia. "December 1968," Business Review (Federal Reserve Bank of Philadelphia) (December 1968). https://fraser.stlouisfed.org/title/5580/item/557483, accessed on April 19, 2024.
Federal Reserve Bank of Philadelphia. "December 1968," Business Review (Federal Reserve Bank of Philadelphia) (December 1968). https://fraser.stlouisfed.org/title/5580/item/557483, accessed on April 19, 2024.