Osborne, Mary Pope <br/><br/>
Polar Bears Past Bedtime. 

 - #12 
 - New York :  A Stepping Stone Book,  1998. 
 - Magic Tree House .
<br/><br/> Donated by the Drown family. 
<br/><br/> Their magic tree house takes Jack and Annie to the Arctic, where a polar bear leads them onto very thin ice. 
<br/><br/><label>ISBN: </label>0-679-88341-X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Polar bear<br/>Arctic regions<br/>Magic<br/>Tree houses<br/>Fantasy