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United States dollar - Wikipedia
What Is USD (United States Dollar)? Definition, Uses, Importance
USD - US Dollar rates, news, and tools | Xe
History of the United States dollar - Wikipedia
Currency Exchange Table (US Dollar - USD) - X-Rates
The Seven Denominations | U.S. Currency Education Program
American money | USAGov
United States dollar - Wikiwand
History of U.S. Currency | U.S. Currency Education Program
USD | United States Dollar | OANDA