Natural resources and development 

 - Tuebingen :  Institute for Scientific Co-Operation, 
 - Semestral 
<br/><br/><label>ISSN: </label>0340-2797 
 = Natural resources and development 
 = Nat. Resour. Dev. 
<br/><br/><label>Subjects--Index Terms: </label>CIENCIAS EN GENERAL