Federal Reserve Bank of New York. "6958. Reappearance of Chain Letters Involving United States Savings Bonds," Federal Reserve Bank of New York Circulars (June 21, 1972). https://fraser.stlouisfed.org/title/466/item/540782, accessed on June 2, 2024.
Federal Reserve Bank of New York. "6958. Reappearance of Chain Letters Involving United States Savings Bonds," Federal Reserve Bank of New York Circulars (June 21, 1972). https://fraser.stlouisfed.org/title/466/item/540782, accessed on June 2, 2024.