Conservation of natural resources / 
editor Guy-Harold Smith 
 - 3a ed. 
 - New York :  John Wiley & Sons,  1965 
 - xi, 533 p.  illus., maps.  25 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Conservation of natural resources--United States.
<br/><br/><label>Subjects--Geographic Terms: </label><br/>United States--Economic conditions.