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Pages coins and currency
Dealer and collector of USA and world paper money.
http://www.pagescoinsandcurrency.com/
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PaperM
They buy and sell collectable world paper money, stocks and bonds.
http://www.paperm.com/
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PCGS Currency
PCGS Currency is the market leader in third-party grading and authentication, grading nearly 100,000 notes since founded in 2005.
http://www.pcgscurrency.com/
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PMG - Paper money guaranty
PMG focuses on only one objective, a standard of consistent and accurate grading.
http://www.pmgnotes.com/
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Polymer note
Created with the sole purpose of disseminating knowledge about polymer bank notes.
http://www.polymernotes.com/
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Polymer banknotes
Reference for polymer bank notes by Stane Straus.
http://www.polymernotes.org/