Federal Reserve Bank of Philadelphia. "May 1967," Business Review (Federal Reserve Bank of Philadelphia) (May 1967). https://fraser.stlouisfed.org/title/5580/item/557463, accessed on April 27, 2024.
Federal Reserve Bank of Philadelphia. "May 1967," Business Review (Federal Reserve Bank of Philadelphia) (May 1967). https://fraser.stlouisfed.org/title/5580/item/557463, accessed on April 27, 2024.