What's your most treasured book?

Day 23 of the 40 day book challenge is 'a book that is a most treasured possession'.

I wrote about buying the Tales of the City first editions during our 2001 jaunt around America and they are definitely my most treasured books. (And I still haven't got Sure of You, if anyone sees it anywhere.)

The first one is signed by the author too. Look how happy that made me!