•The Hitchhiker's Guide to the Universe Series

1. The Hitchhiker's Guide to the Galaxy (1978)
   One Thursday lunchtime the Earth is unexpectedly demolished to make way for a new hyperspace bypass. For Arthur Dent, who has only just had his house demolished that morning, this seems already to be more than he can cope with. Sadly, however, the weekend has only just begun, and the galaxy is a very strange and startling place.

2. The Restaurant at the End of the Universe (1980)
   Facing annihilation at the hands of the warlike Vogons is a curious time to have a cosmically displaced Arthur Dent and his curious comrades in arms as they hurtle through space powered by pure improbability - and desperately in search of a place to eat.

3. Life, the Universe and Everything (1982)
   The unhappy inhabitants of the planet Krikkit are sick of looking at the night sky above their heads - so they plan to destroy it. The universe, that is. Now only five individuals stand between the killer robots of Krikkit and their goals of annihilation...

4. So Long, and Thanks for All the Fish (1984)
   Left at the end of LIFE, THE UNIVERSE AND EVERYTHING with the address for God's Final Message To His Creation, Arthur Dent let this crucial information slip his mind.

5. Mostly Harmless (1992)
   It's easy to become disheartened when your planet has been demolished for an unnecessary hyperspacial express route, the woman you love has vanished in a misunderstanding about the nature of space/time, the spaceship in which you are travelling crashed in flames on a remote and Bob-fearing planet, and all you have to fall back on are a few sandwich-making skills.

6. The Salmon of Doubt: Hitchhiking the Galaxy One Last Time (2002)

• The Ultimate Hitchhiker's Guide to the Galaxy (2002)

• The Hitchhiker's Guide to the Galaxy 25th Anniversary Edition (2004)
  All five volumes
   

Dirk Gently

• Dirk Gently's Holistic Detective Agency (1987)
  Ghost/horror/detective/time travel/romantic comedy epic.

• Long Dark Tea Time of the Soul (1988)

• The Long Dark Tea-Time of the Soul
  Promotional Cassette

• The Long Dark Tea-Time of the Soul & Dirk Gently's Holistic Detective Agency (1999)

Starship Titanic

• Douglas Adams's Starship Titanic (1998) by Terry Jones
  At the heart of our Galaxy, an advanced civilization of which we know nothing has built the biggest, most beautiful starship ever: the Starship Titanic . On its maiden voyage, the biggest, most beautiful, most technologically advanced instellar Etherliner ever built unexpectedly crashes. Into your house.  Also Starship Titanic Dvd and Starship Titanic Mac.

• Douglas Adams Starship Titanic: The Official Strategy Guide (1998) by Neil Richards

Other

• The Meaning of Liff (1984)

• Original Hitchhiker's Guide Radio Scripts (1986)

• Last Chance to See (1990) with Mark Carwardine
  An account of a world-wide search for rare and endangered species of animals.

• The Deeper Meaning of Liff: A Dictionary of Things There Aren't Any Words for Yet--But There Ought to Be (1990) with John Lloyd
  In Life there are many hundreds of common experiences, feeling, situations and even objects which we all know and recognize, but for which no words exist.

Audio

• The Hitchhiker's Guide to the Galaxy: The Tertiary Phase (1995)

Video

• The Making of The Hitchhiker's Guide to the Galaxy (1990)