Star Wars Episode IV: A New Hope novelization

Star Wars Episode IV: A New Hope novelization by George Lucas 
The very first Star Wars book ever, this novel was written by Alan Dean Foster based on George Lucas's script for the original Star Wars movie (Foster agreed to do it without credit). It was released in 1976, six months before the movie, and was then titled Star Wars: From the Adventures of Luke Skywalker.

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This is a movie novelization from the Legends timeline. Though the movie itself is canon, original content in the book could be contradicted by future books, movies, or TV shows (if so, you can think of it as an alternate universe).