Young Main
Young Main上传File:Leonhard Euler.jpg的新版本
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→文件说明
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莱昂哈德·欧拉,来自Kunstmuseum Basel的图片,原始网页:http://sammlungonline.kunstmuseumbasel.ch/eMuseumPlus?service=ExternalInterface&module=collection&objectId=1429&viewType=detailView
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