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http://www.digitalbookindex.org
Digital Book Index provides links to more than 128,000 title records from more than 1800 commercial and non-commercial publishers, universities, and various private sites. About 88,000 of these books, texts, and documents are available free, while many others are available at very modest cost.

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http://freecomputerbooks.com 是一个不错的资源网页。