500 <br/>

                  Mcgraw Hill Science. 

 - New York.:  McGrawHill,  2000. 
 - 272p. -
<br/><br/> Товч хураангуй 
<br/><br/>                 <label>ISBN: </label>0022774343 
<br/><br/>                 <label>Түлхүүр үг: </label>Plants, wateringHeat, Light and Sound, Machines, Magnets, Canyon, Human body,