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Moon of Three Rings (original 1966; edition 1967)
by Andre Norton, Jack (cover) Gaughan (Illustrator)
Moon of Three Rings by Andre Norton (1966)
References to this work on external resources.
Wikipedia in English
Amazon.com Product Description (ISBN 0441541046, Paperback)The primitive world of Yiktor, evoked from myth and legend and ingeniously fused with the future, greets readers with medieval heroes and mysticism, singing prose and an eerie tales.
(retrieved from Amazon Mon, 30 Sep 2013 13:26:03 -0400)
Krip, the Free Trader, is changed into an animal by the strange Moon Singer maiden in an effort to save him from the evil power seekers; but now he faces a more serious danger - that of not being able to return to his human form.
(summary from another edition)
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