Dixon, Franklin W. <br/><br/>
The secret of Pirates' Hill  
by Franklin W. Dixon. 
 - New York, NY :  Grosset & Dunlap,  [c1972] 
 - 178 p. :  ill. ;  20 cm. 
 - His Hardy boys mystery stories,  36. .
 - Dixon, Franklin W.  Hardy boys mystery stories ;  36 .
<br/><br/> Hired to locate an old Spanish cannon, the Hardy brothers uncover an even greater treasure after perilous underwater adventures. 
<br/><br/><label>ISBN: </label>044808936X  5.95 
<br/><br/><label>LCCN: </label>72077108 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mystery and detective stories.