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Preceded by: Life, the Universe and Everything

So Long, and Thanks for All the Fish is the fourth book of the Hitchhiker's Guide to the Galaxy "trilogy" written by Douglas Adams. Its title is the message left by the dolphins when they departed Planet Earth just before it was demolished to make way for a hyperspace bypass, as described in The Hitchhiker's Guide to the Galaxy.

Followed by: Mostly Harmless

Also contained in:

• The Hitch Hiker's Guide to the Galaxy: A Trilogy in Four Parts
• The More Than Complete Hitchhiker's Guide
• Ultimate Hitchhiker's Guide to the Galaxy