verma , p.s. <br/><br/>
environmental biology  principles of ecology /  [[Book] :] 
p.s. verma , v. k. agarwal . 
 - new dlhi :  s. chand & company ltd,  1983. 
 - 591 p. :  ill; ;  21 cm. 
<br/><br/> includes index . . 
<br/><br/><label>ISBN: </label>8121908590 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Biology. --Organisms .<br/>Ecology.
<br/><br/><label>Dewey Class. No.: </label>570 
<br/><br/><label>National Library of Medicine Call No.: </label>570  / V E