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If you look around, estral, you'll find innumerable discussions of this subject.
Basically, a PDF file is not a "book"; it's just a series of page images. It does not contain "text" - it knows nothing about paragraphs, lines, or even words. All that is in a PDF file is a series of instructions of the form "draw this shape at these coordinates".
The result of this is that a PDF file can rarely be converted into any other format very satisfactorily. All the information about the original "document" was "thrown away" during the process of creating the PDF.
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