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The Hitchhiker's Guide to the Galaxy is the first of five books in the Hitchhiker's Guide to the Galaxy comedy science fiction "trilogy" by Douglas Adams (with the sixth written by Eoin Colfer ). The novel is an adaptation of the first four parts of Adams' radio series of the same name.
Mostly Harmless is a novel by Douglas Adams and the fifth book in the Hitchhiker's Guide to the Galaxy trilogy. 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.
The Restaurant at the End of the Universe (1980, ISBN 0-345-39181-0 ) is the second book in the Hitchhiker's Guide to the Galaxy comedy science fiction pentalogy by Douglas Adams .
Life, the Universe and Everything (1982, ISBN 0-345-39182-9 ) is the third book in the five-volume Hitchhiker's Guide to the Galaxy science fiction series by British writer Douglas Adams .
The Hitchhiker's Guide to the Galaxy is a comic science fiction series created by Douglas Adams .
H2G2 on Youtube