Eldon D Enger, Bradley F Smith <br/><br/>
Environmental science : a study of interrelationships 

 - 5th ed 
 - Wm C Brown, Dubuque  1995 
 - 431p 
<br/><br/><label>ISBN: </label>0-697-15907-8 
<br/><br/><label>Dewey Class. No.: </label>301.3 Eng/Smi