"by Franklin W. Dixon [i. e. L. McFarlane]" <br/><br/>
The secret warning 

 -  Grosset and Dunlap, c1966.  2002 
 - 176 
<br/><br/><label>ISBN: </label>9780448089171 
<br/><br/><label>Dewey Class. No.: </label>F823  / 902