Trivedi R.N. <br/><br/>
A textbook of environmental sciences 
R.N. Trivedi 
 - New Delhi  Anmol publication  1997 
 - xi,474p.:  ill  21cm 
<br/><br/>include reference 
<br/><br/><label>ISBN: </label>8174885447 
<br/><br/><label>LC Class. No.: </label>GF47  / .T731997