The Official American Numismatic Association Grading Standards For United States Coins Bressett, Kenneth, Bowers, David: Libros | lagear.com.ar
Coin grading - Wikipedia
Why Grade Coins? What is Grading? Coins 101 | Phoenix Gold Corp
Professional Coin Grading Service: OFF GT COIN GRADING & COU (OFFICIAL GUIDE TO COIN GRADING AND COUNTERFEIT DETECTION) : Dannreuther, John W., Travers, Scott A., Hall, David, Johnson, Jay W.: Amazon.es: Libros