Module 6 the management of ecosystems 

 - London  The Open university  1983 
 - 79p. 
<br/><br/><label>ISBN: </label>0335026230  £4.95 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology<br/>Ecosystems
<br/><br/><label>Dewey Class. No.: </label>577  / MOD