Goel, P K Trisal, C L Trivedy, R K <br/><br/>
Practical methods in ecology and environmental science 

 - Karad  Environmental publications  1987 
 - x, 340 p.; 24cm. 
 - Series in methodology .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology<br/>Environment<br/>Pollution