Clarke, George L. (George Leonard),  1905- <br/><br/>
Elements of ecology / 
George L. Clarke 
 - New York :  John Wiley & Sons,  1954 
 - 534 p. :  ill. ;  24 cm. 
<br/><br/>p. 505-548 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology