I think Asimov and Clarke were real hard science fiction writers and Heinlein sometimes was. He was more freely imaginative and sometimes that went too far. Except for that reread of "Stranger in a Strange Land" a few years ago I don't think I've read any of his books for 20 or 30 years. I have reread some of Clarke's and Asimov's in recent years. I've read "The City and the Stars" every 4 of 5 years since it was written.
Barry
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