Mostly Harmless
Douglas Adams
Hitchhiker's Guide to the Galaxy (5)
The Restaurant at the End of the Universe
Hitchhiker's Guide to the Galaxy (2)
The Salmon of Doubt: Hitchhiking the Galaxy One Last Time
Dirk Gently (3)
So Long, and Thanks for All the Fish
Hitchhiker's Guide to the Galaxy (4)
The Ultimate Hitchhiker's Guide
Last Chance to See
Douglas Adams & Mark Carwardine
The Long Dark Tea-Time of the Soul
Dirk Gently's Holistic Detective Agency
Dirk Gently (1)
The Meaning of Liff
Douglas Adams & John Lloyd
Life, the Universe, and Everything