Well this is maybe somewhat off topic, but not more than other contributions.
Here is a link to the only Hugo-award winning book in the public domain.
Quote:
At the time of the release of this ebook edition of The Big Time, it remains the only Hugo-award-winning work in the public domain. That makes it a very special treasure indeed!
The Big Time tells the tale of a group of servicemembers who work in facilities isolated from regular space-time. They’re involved in a war conducted by two shadowy groups that spans time itself, with all of humanity as pawns on an ever-changing historical battlefield. It explores a fascinating range of themes including time travel, the purpose of war, isolation, and love in the face of it all.
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Link:
https://standardebooks.org/ebooks/fr...r/the-big-time