Allagu Balaguru <br/><br/>
Investigation of bentonite (montmorillonite) clay resources in Lahad Datu area Sabah : RAK (E1) 

 - JMG.SB/IM 01/1991 
 - Ipoh Perak  Jabatan Kajibumi Malaysia  1991 
 - ill:51p. 29.8 cm