Environmental science :  the study of interrelationships / 
Eldon D. Enger... [et al.]. 
 - 3rd ed. 
 - Dubuque, Iowa :  W.C. Brown,  c1989. 
 - xiv, 540 p. :  ill. (some col.). 
<br/><br/>
<br/><br/><label>ISBN: </label>069705134X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology.