Dixon, Franklin W. <br/><br/>
What happened at midnight / 
by Franklin W. Dixon. 
 - New York :  Grosset & Dunlap,  c1967. 
 - 173 p. :  ill. ;  20 cm. 
 - Hardy boys mystery stories ;  10 .
<br/><br/> While protecting a secret invention the Hardys encounter a dangerous gang of jewel thieves. 
<br/><br/> 5.8  Perma-Bound Books. 
<br/><br/><label>ISBN: </label>0448089106 :  $11.84 
<br/><br/><label>LCCN: </label>67010522 /AC 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mystery and Detective Stories
<br/><br/><label>LC Class. No.: </label>PZ7.D644  / Wh 1967 
<br/><br/><label>Dewey Class. No.: </label>Fic