Blyton , Enid <br/><br/>
The mystery secret room  :  

 - Dean :   London ;   1943. 
 - 216 p ; 21 cm   01 
 - 2025-06-03 
<br/><br/><label>ISBN: </label>9780603567001 
<br/><br/><label>Nat. Bib. No.: </label>0011302 
<br/><br/><label>Nat. Bib. Agency Control No.: </label>BLY 
<br/><br/><label>Universal Decimal Class. No.: </label>823