National conference on pollution, man and environment with special reference to north-east India held in Shillong on June 15th to 16th, 1999 
organised by Shillong College Academic Society 
 - Shillong   Shillong College  2000 
 - 236p.; 28cm. 
<br/><br/> Library has Proceedings volume 
<br/><br/><label>Dewey Class. No.: </label>DB333.7095416  / NAT