Groundwater and the environment :  proceedings of the International Groundwater Conference IGW2-90 / 
organised by The Faculty of Engineering, Universiti Kebangsaan Malaysia ... [et.al.] 
 - 1 v. (various pagings) ;  32 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water, Underground--Congresses<br/>Water, Underground--Malaysia--Congresses