W.B. Clapham <br/><br/>
Natural ecosystems 
Clapham, W.B 
 - 2nd ed. 
 - New York  Macmillan Publishing  1983 
 - ix, 282p,:  ill,. Hbk.: 
<br/><br/><label>ISBN: </label>0023225203 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology