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There are three ways to get a high quality professional scan of a book:
1. Cut the binding and scan the pages either with a sheetfed or flatbed scanner.
2. Have a very high end scanner specially designed to compensate for the curvature of a book.
3. Use a camera.
A flat bed scanner is less satisfactory than a camera because of the curvature of the book. Camera scanning can be OCRd with a product like ABBYY and made into an ebook. Handheld scanners are terrible and good for minimal scanning. The main reason is that there are almost no handheld scanners made is that digital cameras are better. Scholars who work in libraries regularly use digital cameras.
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