Rapp, A. <br/><br/>
Can desert encroachment be stopped 

 - Stockholm :  United Nations. Environment Programme,  1976 
 - 241 p.  : ilus. 
 - Ecological bulletin  ; 24 .
 - Ecological bulletin  ; 24 .
<br/><br/><label>LCCN: </label>44975 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Desiertos.<br/>Regiones áridas.
<br/><br/><label>Dewey Class. No.: </label>631.0915  / R3