Blyton Enid <br/><br/>
Secret Seven On the Trail 
Blyton Enid 
 - London  Clays Ltd, St Ives plc  1992 
 - 111p. 
<br/><br/><label>ISBN: </label>0340569832 
<br/><br/><label>Dewey Class. No.: </label>823  / BLY