Federal Reserve Bank of Philadelphia. "March 1971," Business Review (Federal Reserve Bank of Philadelphia) (March 1971). https://fraser.stlouisfed.org/title/5580/item/557510, accessed on April 19, 2024.
Federal Reserve Bank of Philadelphia. "March 1971," Business Review (Federal Reserve Bank of Philadelphia) (March 1971). https://fraser.stlouisfed.org/title/5580/item/557510, accessed on April 19, 2024.