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Someone already said Jules Verne - I really liked his book Black Diamonds or something like that. Also C.S. Lewis' Trilogy Out of the Silent Planet, Perelandra and That Hideous Strength is great. THere are some allusions to Tolkien in Hideous Strength that I really liked
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Connie Willis
Connie tells a great story, and she has won just about every sci-fi writing award there is. I'm not really into the genre, but because I knew her in college, I tried reading one of her books that was recommended to me: The Doomsday Book about time travelers who lose one of their colleagues in England just about the time Plague is about to start. That led me to another of her books, also about time travel (Tom Jones type of antics): To Say Nothing of the Dog.