Federal Reserve Bank of Philadelphia. "July 1961," Business Review (Federal Reserve Bank of Philadelphia) (July 1961). https://fraser.stlouisfed.org/title/5580/item/557393, accessed on May 4, 2024.
Federal Reserve Bank of Philadelphia. "July 1961," Business Review (Federal Reserve Bank of Philadelphia) (July 1961). https://fraser.stlouisfed.org/title/5580/item/557393, accessed on May 4, 2024.