Blyton , Enid  <br/><br/>
The secret seven : s ecret seven mystery  

 - Hodder :   London ;   1957. 
 - 99 p ; 21 cm .  01 
 - 2025-06-09 
<br/><br/><label>ISBN: </label>034089315X 
<br/><br/><label>Nat. Bib. No.: </label>0011317 
<br/><br/><label>Nat. Bib. Agency Control No.: </label>BLY 
<br/><br/><label>Universal Decimal Class. No.: </label>823