Common, scarce and rare Obsolete Notes (currency; paper money; mostly U.S.) at Mintmark.com.
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". . . The United States dollar is unique in that there have been more than 10 types of banknotes, such as Federal Reserve Bank Note, gold certificate, and United States Note. The Federal Reserve Note is the only type that remains in circulation since the 1970s . . ." — United States dollar at Wikipedia
