Trivedi, P. R. & Raj, Gurdeep <br/><br/>
Encyclopaedia of environmental sciences ; Vol-19  Management and environmental education and research 

 - New Delhi  Akashdeep Publishing House  1992 
 - 254  Hb 
<br/><br/><label>ISBN: </label>81-7158-279-6 (set) 
<br/><br/><label>Subjects--Facted Index Terms: </label><br/>
<br/><br/><label>Dewey Class. No.: </label>R551