How Do You Know if You Have a Book That's Signed?

I have an attachment to books as if they're friends. It's very hard for me to part with them. If I have a book that's autographed, I read it even more intently because it's like a magic on-fire sparked book. The first thing I do when I get a book is to look at it to see if it's signed. I have thousands of signed books. everybody has one. Everybody has one. Boom. There's a thinker.