Clapham, W.  1942- <br/><br/>
Natural ecosystems / 
W. B. Clapham, Jr. 
 - New York :  Macmillan,  [1973] 
 - viii, 248 p. :  ill. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology.
<br/><br/><label>LC Class. No.: </label>QH541  / .C45 
<br/><br/><label>Dewey Class. No.: </label>574.5