Template:Book category header
This category contains pages that are part of the Book category header book. If a page of the book isn't showing here, please add text {{BookCat}} to the end of the page concerned. You can view a list of all subpages under the book main page (not including the book main page itself), regardless of whether they're categorized, here.
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Usage
Use this template on a book category, containing all the pages of a book (rather than, say, a subject category containing all books relating specifically to that subject; or some other kind of category). See Using Wikibooks/Shelves, Categories, and Classifications for details.
Internals
The list of subpages link via Special:PrefixIndex puts a slash after the book name, thus excluding the book main page, because the slash also prevents listing pages of other books whose names have the current book's name as a prefix (for example, at this writing, Special:PrefixIndex/Apache).