The Salmon of Doubt
Douglas Adams
The Ultimate Hitchhiker's Guide - All Six Books
The Restaurant at the end of the universe
So Long, and Thanks for All the Fish
Young Zaphod Plays It Safe
Last Chance to See
Mostly harmless
The long dark tea-time of the soul
Life, the Universe and Everything
Dirk Gently's Holistic Detective Agency
HHGTTG - The Lost Chapters
The hitchhiker's guide to the galaxy