Hope, Laura Lee. <br/><br/>
The Bobbsey twins' mystery on the deep blue sea. 

 - New York,  Grosset & Dunlap  [1965] 
 - 177 p.  illus.  20 cm. 
 - Her The Bobbsey twins books,  11 .
<br/><br/><label>ISBN: </label>0448080117 
<br/><br/><label>LCCN: </label>65018449  
<br/><br/><label>LC Class. No.: </label>PZ7.H772  / Boll