Environmental science / 
Amos Turk, Jonathan Turk, Janet T. Wittes, Robert E. Wittes. 
 - 2d ed. 
 - Philadelphia :  Saunders,  1978. 
 - xiii, 597 p. :  ill. 
 - Saunders golden sunburst series in environmental studies .
<br/><br/><label>ISBN: </label>0721689272 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology.<br/>Environmental sciences.<br/>Environmental protection.