The Hitchhiker's Guide to the Galaxy is an electronic book from the film of the same name. It is considered to be one of the best encyclopedias in the galaxy.
The Hitchhiker's Guide to the Galaxy is a wholly remarkable book. Perhaps the most remarkable, certainly the most successful, ever to come out of the great publishing corporations of Ursa Minor. More popular than The Celestial Homecare Omnibus, better selling than and more controversial than Oolon Colluphid's trilogy of philosophical blockbusters, Where God Went Wrong, Some More of God's Greatest Mistakes, and Who is this God Person, Anyway? It's already supplanted the Encyclopedia Galactica as the standard repository of all knowledge and wisdom for two important reasons. First of all, it's slightly cheaper, and secondly, it has the words "Don't Panic" inscribed in large, friendly letters on its cover.