American Numismatic Association http://www.money.org |
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Numismatic Guaranty Corporation http://www.ngccoin.com |
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Professional Coin Grading Service http://www.pcgs.com |
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Stop Coin Fraud http://www.stopcoinfraud.com/nca |
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United States Mint http://usmint.gov |
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Numismatic Crime Information Center http://www.numismaticcrimes.org |
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ICTA Industry Council for Tangible Assets http://www.ictaonline.org |
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CAC Certified Acceptance Corporation http://www.caccoin.com |