In this case, on the top corner of the book. I occasionally buy some of my books used, and they have stickers and stamps on them. I generally don't mind but this one is on the top of the book when the book is closed (on the top of the page), and it is some ink stamp. I tried removing it with water, and I even tried to sand it off but it doesn't seem to want to budge. Does anybody know a good solution that would get this off?