Llewellyn, Claire. <br/><br/>
Light and dark / 
by Claire Llewellyn. 
 - London :  Evans Brothers,  2004. 
 - 24 p. :  ill., col ;  27 cm. 
 - Start-Up Science. .
 - Start-Up Science. .
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0237525917 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Light--Juvenile Literature.