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Sir Cumference and the Viking's Map (Charlesbridge Math Adventures)
Sir Cumference and the Viking's Map - Charlesbridge Math Adventures Author:Cindy Neuschwander, Wayne Geehan (Illustrator) As bungling bandits pursue them, cousins Radius and Per use coordinate geometry in their quest for treasure of the greatest measure as they decode the treasure map of Viking warrior Xaxon Yellowbearyd.