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How to test the authenticity of books?
The original English version of the chart paper is very good, not easy to break, waterproof. The following is an illustration.

Navigation books, if they are genuine books published by the British Marine Survey, have the logo of British Publishing House in the upper left corner of the book. Only from the side, the cover color of pirated books will be brighter. Reference website: www.huazhihang.com?