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The first legal tender $1 note, which was issued during the Civil War, did not feature George Washington.

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World Banknotes & Coins Pictures

Petroleum in Real Life: Money - Context Magazine by CAPP

Incredibly rare US bank bills set to sell for $8 million at

SGD Currency: Singapore Dollar History and Fascinating Facts

$10,000 bill from Great Depression era sells for $480,000 at

TWENTY DOLLAR $20 U.S. Bill Genuine Legal Tender Currency

When will Harriet Tubman make her appearance on the $20? - The

A visual history of U.S. $20 bills, ranked - The Washington Post

Legal Tender: Definition, Economic Functions, Examples