Allen, Shirley W. <br/><br/>
Conserving natural resources / 
Shirley W. Allen 
 - New York :  McGraw-Hill ,  1955 
 - ix, 374p. ;  25 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Natural resources
<br/><br/><label>Dewey Class. No.: </label>333.9  / ALL