Science and technology education / 
Digumarti Bhaskara Rao 
 - New Delhi :  Discovery Publishing House,  2001 
 - vi, 557 p. :  ill.   23 cm. 
<br/><br/><label>ISBN: </label>8171415687 
<br/><br/><label>Subjects--Topical Terms: </label><br/>    Science;Technology
<br/><br/><label>Universal Decimal Class. No.: </label>371.3078