Paul S.Welch <br/><br/>
Limnological methods / 
by Paul S. Weich. 
 - New Delhi;  Narendra Publishing House:  2009. 
 - 381p.:  ill., photographs;  21cm. 
<br/><br/>includes index 
<br/><br/><label>ISBN: </label>8185375801 
<br/><br/><label>Dewey Class. No.: </label>551.48  / PAU/L