Kircher, Harry B., <br/><br/>
Our natural resources / 
Harry B. Kircher, P. E. McNall ; consultant, Donald L. Wallace. 
 - Fourth edition. 
 - xviii, 371 pages :  illustrations ;  24 cm. 
<br/><br/> Authors names in reverse order in previous ed.  Includes index.  Previous ed. entered under P.E. McNall. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Natural resources--United States.<br/>Conservation of natural resources--United States.