Federal Reserve Bank of Philadelphia. "April 1961," Business Review (Federal Reserve Bank of Philadelphia) (April 1961). https://fraser.stlouisfed.org/title/5580/item/557390, accessed on March 28, 2024.
Federal Reserve Bank of Philadelphia. "April 1961," Business Review (Federal Reserve Bank of Philadelphia) (April 1961). https://fraser.stlouisfed.org/title/5580/item/557390, accessed on March 28, 2024.