Encyclopaedia Of Environmental Biology ( 2 Vol. Set) Vol-I 
Chhatwal 
 - 1st 
 -  Anmol  1998 
 - 791 
<br/><br/><label>ISBN: </label>8174886524 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Economics
<br/><br/><label>Dewey Class. No.: </label>577.01  / CHH.1