Federal Reserve Bank of Philadelphia. "February 1967," Business Review (Federal Reserve Bank of Philadelphia) (February 1967). https://fraser.stlouisfed.org/title/5580/item/557460, accessed on April 18, 2024.
Federal Reserve Bank of Philadelphia. "February 1967," Business Review (Federal Reserve Bank of Philadelphia) (February 1967). https://fraser.stlouisfed.org/title/5580/item/557460, accessed on April 18, 2024.