paper r for covering books 书皮纸
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Printed paper case (PPC) : a common finish for hardback children's books, where the covering material over the boards is paper which has been printed and laminated.
印刷纸封壳：硬皮儿童书籍常用的修饰方法。书壳的包面材料是经过印刷和裱胶的纸。
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