Enger, Eldon D.  <br/><br/>
Environmental science: 	  a study of interrelationships/ 
Eldon D. Enger and Bradley F. Smith 
 - Eleventh edition 
 - Boston:    Mc Graw-Hill/ Higher Education,   c2009. 
 - xxiv, 488 pages :   illustrations ;   26 cm. 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>9780071282758 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental science.