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A comment on PDF Is the World's Most Important File Format. Parent comment
If your pdf book does not have it, there's some readers who can add it. e.g. https://helpx.adobe.com/acrobat/using/creating-pdf-indexes.h...
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If your pdf book does not have it, there's some readers who can add it. e.g. https://helpx.adobe.com/acrobat/using/creating-pdf-indexes.h...