Federal Reserve Bank of Philadelphia. "May 1961," Business Review (Federal Reserve Bank of Philadelphia) (May 1961). https://fraser.stlouisfed.org/title/5580/item/557391, accessed on April 18, 2024.
Federal Reserve Bank of Philadelphia. "May 1961," Business Review (Federal Reserve Bank of Philadelphia) (May 1961). https://fraser.stlouisfed.org/title/5580/item/557391, accessed on April 18, 2024.