May Books 10) Quidditch Through The Ages, by J.K. Rowling
I had a record of acquiring this book years ago, but have been unable to locate it, and spotted another copy going cheap when in Ireland so filled the gap. Not really worth bothering with, as it turns out; Quidditch is a one-joke game, stretched here to over a hundred well-padded pages. I suppose that the detail of Quidditch history and technicalities may be a source of inspiration for fan fiction, but I would observe that most fanfic I have encountered features rather different leisure activities...