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When books are opened for reformatting by microfilm, photocopy, or digital imaging, it is important not to split the backbones by carelessly and roughly forcing the text to open directly to the back. In a stab-sewn or Chinese double-leaf book the sewing thread can cut into the text if the book is forced open at too great an angle. If readers have access to photocopying machines, their use of the machines should be monitored to help prevent damage to the structure of books through careless handling. For microfilming, book support cradles can be used to lessen the effects of drastic opening. For photocopying, right-angled copiers can be used so that the text is opened to only a 90-degree angle. For digital imaging, a digital camera can be used in combination with a right-angled brace or a cradle, or through a prism scanner.
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