I have a great little book "Where is Maisy?".  It's a small-format board book with great undamaged flaps. One page was marked on with an ink pen and I got most of it off with a Magic Eraser, but as a result the page is a little roughed up.  It's still a nice book, and it's FREE with purchase of any book from my bookshelf.  Just ask!  I have 150 or so books on my bookshelf- most of them quality childrens' books.