Wilderness U.S.A./ 
National Geographic society 
 - 344 p. \ 30 cm  il. 
<br/><br/> Inclye apéndice 
<br/><br/><label>Subjects--Topical Terms: </label><br/>1.Desiertos
<br/><br/><label>Dewey Class. No.: </label>C 574.526 52 N277