New unesco source book for science teaching 

 - Hyderabad  Universities press  1999 
 - 270p. 
<br/><br/><label>ISBN: </label>8173712018 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Physical science<br/>Magnetism and electricity<br/>Earth and space science
<br/><br/><label>Dewey Class. No.: </label>507  / UN