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The Tripods
Book series by John Christopher
The Tripods
The Tripods is a series of young adult science fiction novels by John Christopher. The series takes place in a post-apocalyptic world where humanity is enslaved by "Tripods"—gigantic three-legged walking machines piloted by an alien race later identified as the "Masters". The first two books were the basis of a science fiction TV series, produced in the United Kingdom in the 1980s.
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