Dixon, Franklin W. <br/><br/>
The secret of Pirates' Hill / 
by Franklin W. Dixon 
 - New York :  Grosset & Dunlap,  [c1972] 
 - 17p. :  ill. ;  20cm. 
 - His 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 (hbk.) : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Detective and mystery stories<br/>English fiction
<br/><br/><label>Dewey Class. No.: </label>F DIX