Parson, Ruben L <br/><br/>
Conserving American resources / 
by Ruben L. Parson, and associates J. Lee Guernsey ... [et al.] 
 - 3rd ed. 
 - Englewood Cliffs, N.J. :  Prentice-Hall,  1972 
 - x, 608 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references 
<br/><br/><label>ISBN: </label>0131677675 
<br/><br/><label>LCCN: </label>75-173428 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Conservation of natural resources--United States