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Google Book Search
Search and preview millions of books and magazines from libraries and publishers worldwide. If the book is out of copyright, or the publisher has given permission, you'll be able to see a preview of the book, and in some cases the entire text. If it's in the public domain, you're free to download a PDF copy. Also provides links to libraries that hold the book.
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Find what you want in a library near you with WorldCat, a global catalog of library collections.