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One of the most useful, if often-overlooked, features of Google Book Search is the ability to enter your own books and create a personal library which you can then search if Google has scanned those books. (And chances are it probably has). If you are trying to find a passage or a factoid you once read but can't remember the book no matter how hard you wrack your brain, the ability to search your personal library can come in handy. Except who wants to enter each book one at a time?