28th annual convention of ISTE & national seminar on environment & development 

 - Ludhiana,  PAU,  1998 
 - 167p 
<br/><br/><label>Subjects--Topical Terms: </label><br/> ISTE- National Seminar  Environment & Development
<br/><br/><label>Dewey Class. No.: </label>629.477   / T239S