Rapp, A <br/><br/>
Can desert encroachment be stopped ?  a study with emphasis on Africa 

 - Stockholm  Swedish Natural Science Research  1976 
 - 241 p. 
 - Ecological bulletns; no.  24. .
<br/><br/><label>ISBN: </label>9154602122 
<br/><br/><label>Subjects--Topical Terms: </label><br/>LIFE SCIENCES
<br/><br/><label>Dewey Class. No.: </label>574.5  / CAN