Tomi Jefri,  <br/><br/>
The twins' problem :   mass 

 - 36 pages :   colour illustrations ;   23 cm 
 - Marvellous science tales .
 - Marvellous science tales .
<br/><br/><label>ISBN: </label>9830223469 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Readers
<br/><br/><label>Dewey Class. No.: </label>428.6