Yep, it's a kids book no two ways about it (not that there's anything wrong with liking kid's books when you're all growned up). And the Sil and UT are under Other, because they aren't conventional fiction by any stretch of the imagination, and nor are they non-fiction reference books in the strictest sense so they have to be other.
Btw, my favourite bit from the Win in the Willows is Mole getting lost in the woods, scared the hell outa me :D and then Badger rescues him and everything's better, fantastic! *wanders off in search of his old books*
http://www.plasticsquirrel.co.uk for all your bizarre music and musings needs