There are 2 books in the Star Wars Trilogy Boxed Sets series. The newest book is The Star Wars Trilogy which came out in 1993.

1
The Prequel Trilogy

By R. A. Salvatore , Matthew Stover , Terry Brooks

Book cover of The Prequel Trilogy: Star Wars
For the first time in one stunning volume, here is the complete, epic story arc: The Phantom Menace, Attack of the Clones, and Revenge of the Sith. Experience the sweeping tale of good and evil, of myth and magic, of innocence and power–and witness the tragic transformation of Anakin Skywalker…
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