NCERT (PUB) <br/><br/>
SCIENCE TEXTBOOK FOR CLASS IX 

 -  NATIONAL COUNCIL OF EDUCATIONAL RESEARCH AND TRAINING  2006 
 - 218 
<br/><br/><label>ISBN: </label>8174504923 
<br/><br/><label>Subjects--Topical Terms: </label><br/>NATURAL SCIENCES
<br/><br/><label>Dewey Class. No.: </label>500 P6 ERT