Federal Reserve Bank of Philadelphia. "September 1961," Business Review (Federal Reserve Bank of Philadelphia) (September 1961). https://fraser.stlouisfed.org/title/5580/item/557395, accessed on April 25, 2024.
Federal Reserve Bank of Philadelphia. "September 1961," Business Review (Federal Reserve Bank of Philadelphia) (September 1961). https://fraser.stlouisfed.org/title/5580/item/557395, accessed on April 25, 2024.