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What Are Banknotes and How Are They Used? - Investopedia
Banknote - Wikipedia
Identifying Banknotes | U.S. Currency Education Program
Federal Reserve Note - Wikipedia
Banknotes of the United States dollar - Wikipedia
The Seven Denominations | U.S. Currency Education Program
What Is a Banknote? - The Balance
History of U.S. Currency | U.S. Currency Education Program
The Fed - How do I determine if a banknote is genuine? What …
Introduction to bank notes (video) | Khan Academy