Singh J.S.  Singh Gupta S.P. <br/><br/>
Ecology Environment and Resource Conservation 

 - New Delhi  Anamaya  2006 
<br/><br/><label>ISBN: </label>0000050219 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Ecology <br/> Environment <br/> Resource<br/>Conservation <br/>Environmental app health
<br/><br/><label>Dewey Class. No.: </label>620.8