Environmental science : A study of entrepreneurship 
Enger, Eldon D. 
 - Sixth edition. 
 -  McGraw-Hill  Inc.  1998 
 - xxi,456 pages 
<br/><br/>
<br/><br/><label>ISBN: </label>0-07-353254-1 (hard copy : alk. paper) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental sciences.
<br/><br/><label>Dewey Class. No.: </label>363.7 En3e 1998