How to view series together on iBooks?

I

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When looking through my iBook library I notice that some series of books were collected together, one behind the other. When I taped the book on top it opened a window to show the other books in the series. The thing is I didn't buy the books through iTunes, but it shows me the missing ones and a link to buy them from iTunes. while other books series where just side by side. It would make for easier viewing if all my series where collected together. But how do I do this on?
 

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