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Hex by Kenneth Robeson Icerigger by Alan Dean Foster The Jaws that Bite, the Claws that Catch by Michael G. Coney Key Out of Time by Andre Norton Lamarchos by Jo Clayton
... theme, go to Andre Norton and her Time Trader series: The Time Traders, Galactic Derelict, The Defiant Agents, and Key out of Time. And I third to Say Nothing of the Dog and The Anubis Gates.
