Purdom, P. Walton. <br/><br/>
Environmental science :  managing the environment / 
P. Walton Purdom, Stanley H. Anderson  
 - Columbus, Ohio :  Merrill,  c1980. 
 - xi, 523 p., [2] leaves of plates :  ill. ;  26 cm. 
<br/><br/> Includes index. 
<br/><br/>Includes bibliographical refrences. 
<br/><br/><label>ISBN: </label>067508170X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology.<br/>Environmental protection.<br/>Environmental sciences.