Allen, Shirley Walter,  c1883. <br/><br/>
Conserving natural resources :  principles and practice in a democracy / 
[by] Shirley Walter Allen [and] Justin Wilkinson Leonard. 
 - 3rd edition. 
 - New York :  McGraw-Hill Book Company  Incorporation,  c1966. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Conservation of natural resources--United States.
<br/><br/><label>LC Class. No.: </label>HC103.7  / .A7 1966 
<br/><br/><label>Dewey Class. No.: </label>333.72