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