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Retro Hugo Winner, awarded 2004 for the year 1954. The Retro Hugos were established to honor books during a year that a Worldcon was held, but no Hugos were awarded. I'm not including these as primary reads, as they represent not what the voters at the time thought was the best science fiction of the year, but rather which science fiction held up the best by modern eyes.
The other two Retro Hugo winners (as of 2013) are paired with another book by the same writer, but Bradbury this was Bradbury's only Hugo winning novel. Thus I have chosen October of 2013 not out of any ties to A Case of Conscience, but rather to coincide with Banned Books Week. I often this of this as a meta-banned book, a book about book destruction which itself has been frequently challenged and banned.
The other Retro Hugo nominees:
* Childhood's End by Arthur C. Clarke
* Mission of Gravity by Hal Clement
* The Caves of Steel by Isaac Asimov
* More than Human by Theodore Sturgeon