Trends in research and in the application of science and technologie for arid zone development. 

 - París :  UNESCO,  1979. 
 - 53 p. 
 - MAB technical notes ;  10 .
<br/><br/><label>ISBN: </label>9231015974 
<br/><br/><label>No. de Clasificación Universal Decimal: </label>338.984 (252) =20 TEN No.10.