@OzDiver You really shouldn't feel guilty about that, someone else is going to get the pleasure of that book. :-) I was given a book by my brother that I already had. It's the thought that counts. I've never told him and I will give it away too.
@Zoranna Thank you. That's a strange coincidence, as this book was given to me by my sister 馃檪 I never told her that I already had it and just graciously accepted the gift from her.