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These three books, "Marsbound, (I can't find the second installment - and "Earthbound" are really, honest, truly terrific science fiction (the hard type of sci fi - concerning "logical" means that might eventually, during the future, develop such technological breakthroughs which might actually come into being.

No fantasy here, just a really, really good book that carries its' readers into space, descriptions of crowded quarters for a reasonably long time -- Haldeman excels at that, and at characterization. This is the perfect vehicle to interest a young person into science fiction-- hopefully to inspire this reader
to go on to Arthur C. Clarke or Isaac Asimov, Robert Heinlein, etc.

If one hasn't read much science fiction, these books are a phenomenally good way to "get into the groove" and travel the far-reaching universe!