577<br/>VER<br/><br/>
1557<br/><br/>
Verma, P. S. <br/><br/>
PRINCIPLES OF ECOLOGY 

. – 4th ed. 
. – NEW DELHI :  SULTAN CHAND.
<br/><br/>591 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>ECOLOGY
<br/><br/><label>Dewey Class. No.: </label>577  / VER