Allen, Shirley Walter . <br/><br/>
Conserving Natural Resources: Principles and Practice in a Democracy /  Textual Documents 
Shirley Walter Allen. 
 - 2nd ed. / 
 - New York :  McGraw - Hill book company ,  C1959. 
 - vii,370p. :  ill ;  23cm . 
<br/><br/>Index 
<br/><br/><label>Subjects--Index Terms: </label>Geology Natural Resources G-Geology 
<br/><br/><label>Dewey Class. No.: </label>553  / Al 54 C