Federal Reserve Bank of Philadelphia. "June 1971," Business Review (Federal Reserve Bank of Philadelphia) (June 1971). https://fraser.stlouisfed.org/title/5580/item/557513, accessed on April 19, 2024.
Federal Reserve Bank of Philadelphia. "June 1971," Business Review (Federal Reserve Bank of Philadelphia) (June 1971). https://fraser.stlouisfed.org/title/5580/item/557513, accessed on April 19, 2024.