The golden age of SF has not quite made it into PD, with the exception of a few books and stories. Harry Harrison has a few books that can be found, Clifford Simak also has a few stories. The most famous author that has something for free is probably Isaac Asimov, whose story "Youth" is available as a free download (I've got it but havent read it yet).
I'd really like to see Arthur Clarke and Heinlein released to PD, but under current laws its not gonna happen. At least Heinlein has some books released by the publisher as ebooks, Arthur C. Clarke has nothing released as such.
Vic
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