Neuschwander, Cindy. <br/><br/>
Sir Cumference and the Viking's map :  a math adventure / 
Cindy Neuschwander ; illustrated by Wayne Geehan. 
 - Watertown, MA :  Charlesbridge,  c2012. 
 - 32 p. :  col. ill. ;  25 cm. 
<br/><br/> "Xaxon Yellowbearyd was the fiercest Viking warrior of his time. Now a map to his hidden treasure lies in the hands of Radius and Per. Together the cousins must decode the strange numbered grid on the map--and figure out the secret of the Viking's X and Y axes. As bandits pursue them, Radius and Per track down clues and use coordinate geometry in their quest for "treasure of the greatest measure"."--Dust jacket flap. 
<br/><br/><label>ISBN: </label>9781570917912 (reinforced for library use) 1570917914 (reinforced for library use) 9781570917929 (softcover) 1570917922 (softcover) 
<br/><br/><label>LCCN: </label>2011000865 
<br/><br/><label>Nat. Bib. Agency Control No.: </label>015969923  Uk 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Coordinates--Juvenile literature.<br/>Geometry, Analytic--Juvenile literature.<br/>Coordinates.<br/>Geometry, Analytic.
<br/><br/><label>LC Class. No.: </label>QA 556  / .N478 2012