Series
Science of Discworld
4 books
Book 1
The Science of Discworld
Terry Pratchett
Book 2
The Science of Discworld II: The Globe
Terry Pratchett, Ian Stewart, Jack Cohen
Book 3
The Science of Discworld III: Darwin's Watch
Ian Stewart, Jack Cohen, Terry Pratchett
Book 4
The Science of Discworld IV: Judgment Day
Terry Pratchett, Ian Stewart, Jack Cohen