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Mostly Harmless is a novel by Douglas Adams and the fifth book in the Hitchhiker's Guide to the Galaxy series. It is described on the cover of the first editions as "The fifth book in the increasingly inaccurately named Hitchhikers Trilogy". It was the last Hitchhiker's book written by Adams.

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 Book of General Ignorance is the first in a series of books based on the final round in the intellectual British panel game QI, written by series-creator John Lloyd and head-researcher John Mitchinson, to help spread the QI philosophy of curiosity to the reading public. It is a trivia book, aiming to address and …