Allen, Shirley Walter,  1883- <br/><br/>
Conserving natural resources :  principles and practice in a democracy / 
by Shirley Walter Allen and Justin Wilkinson Leonard 
 - 3rd ed. 
 - New York :  McGraw-Hill,  1966 
 - vii, 432 p. :  illus., maps. ;  23 cm. 
<br/><br/>Includes bibliographical references 
<br/><br/><label>LCCN: </label>65-028230 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Conservation of natural resources--United States