Bradbury's first book from a major publisher, The Martian Chronicles from Doubleday in 1950. That little logo saying "science fiction" was something that Bradbury fought against - not because he was opposed to science fiction, but because he considered The Martian Chronicles to be fantasy rather than SF.
But it was a battle he did not win, and the label continued to stick despite the fact that most of his work was not SF. (Bradbury maintained that Fahrenheit 451 was his only science fiction book, because he considered that it showed a possible world rather than the impossibility of The Martian Chronicles.)
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