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Red Planet (original 1949; edition 2006)
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Amazon.com Product Description (ISBN 0345493184, Paperback)Jim Marlow and his strange-looking Martian friend Willis were allowed to travel only so far. But one day Willis unwittingly tuned into a treacherous plot that threatened all the colonists on Mars, and it set Jim off on a terrfying adventure that could save--or destroy--them all!
From the Paperback edition.
(retrieved from Amazon Thu, 14 Apr 2011 09:42:50 -0400)
A young colonist on Mars befriends a strange round creature called Willis who gets him into trouble when he goes away to school, but whose presence and friendship finally enable the colonials to negotiate a treaty with the Martians.
(summary from another edition)
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