Natural resources and development 

 - Tubingen, Germany :  Institute for Scientific Co-operation,  1974- 
 - v. ;  24 cm 
<br/><br/> UKM: v.27 (1988)-. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Natural resources--Periodicals<br/>Geology--Research--Periodicals