FILE - This undated file photo provided by the U.S. Mint shows the President John Adams presidential $1 coin. Congressional auditors say doing away with dollar bills entirely and

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FILE - This undated file photo provided by the U.S. Mint shows the President John Adams presidential $1 coin. Congressional auditors say doing away with dollar bills entirely and replacing them with dollar coins could save taxpayers some $4.4 billion over the next 30 years. (AP Photo/US Mint, File) less