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en.wikipedia.org/wiki/United_States_Note

A United States Note, also known as a Legal Tender Note, is a type of paper money that was issued from 1862 to 1971 in the U.S. Having been current for more than 100 years, they were issued for longer than any other form of U.S. paper money. They were known popularly as "greenbacks", a name inherited from the ...

coinmill.com/USD_calculator.html

Convert money in United States Dollar (USD) to and from foreign currencies using up to date exchange rates.

themoneyconverter.com/USD/SGD.aspx

Currency converter to convert from United States Dollar (USD) to Singapore Dollar (SGD) including the latest exchange rates, a chart showing the exchange rate history for the last 120-days and information about the currencies.

mises.org/blog/use-us-dollars-mandatory-united-states

Jan 15, 2015 ... Are you required to use dollars for all transactions in the United States? Sometimes, I receive submissions from columnists that suggest or even outright assert that it is illegal to use currencies other than the US dollar in the United States. This is not the case.