Purdom, P. W. <br/><br/>
Ecosystems and Human Affairs. 

 - Ohio :  Charles E. Merrill Publishing Company,  1980. 
 - 402p.  Table, illus.  24cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecosystems and Human Affairs
<br/><br/><label>LC Class. No.: </label>QH 541.5  / P87 1980