Smith Guy Harold <br/><br/>
Conservation of natural resources 
Smith Guy Harold 
 - 4th 
 - New York  John Wiley & Sons        1971 
 - xiii,685p.  cm. 
<br/><br/><label>ISBN: </label>0 471801925 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>U671.73, J8;L1