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现可提供2019年1月前，中国大陆出版图书的扫描PDF电子书。
http://www.ucdrs.superlib.net/ 这个网站，有试读的，大多可以提供完整文件，请提供相关链接。
上面网站查不到的，也可以提供 www.jd.com , www.dangdang.com 之类正规网上书店的链接，以方便确认图书信息
请提供相关的图书信息的链接，或是可复制的ISBN号
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