美元所有硬币图片
http://www.fotosearch.cn/comp/six/SIX121/%E7%BE%8E%E5%9B%BD%E4%BA%BA-%E7%BE%8E%E5%85%83-%E7%A1%AC%E5%B8%81_~015na1.jpg
各州纪念币图片
http://www.chinagoldcoin.net/shidian/2002-12-31/image/tu.jpg
http://image.baidu.com/i?ct=201326592&cl=2&lm=-1&tn=baiduimage&pv=&word=%C3%C0%D4%AA%D3%B2%B1%D2%CD%BC%C6%AC&z=0&fm=rs4
http://www.coinabc.com/thread-54441-1-1.html
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