Blyton , Enid  <br/><br/>
The  secret seven : secret seven on the trail  

 - Hodder :  London ;  2009. 
 - 137 p . 21 cm   01 
 - 2025-05-22 
<br/><br/><label>ISBN: </label>9780340680940 
<br/><br/><label>Nat. Bib. No.: </label>0011220 
<br/><br/><label>Nat. Bib. Agency Control No.: </label>BLY 
<br/><br/><label>Universal Decimal Class. No.: </label>823