Hari Singh Sidhu
Report on the groundwater investigation at rock chemical industries Pengkalan Pegoh Ipoh - GPH 5/1986 - Ipoh Perak Jabatan Penyiasatan Kajibumi Malaysia 1986 - ill:16p. 29.8 cm
Report on the groundwater investigation at rock chemical industries Pengkalan Pegoh Ipoh - GPH 5/1986 - Ipoh Perak Jabatan Penyiasatan Kajibumi Malaysia 1986 - ill:16p. 29.8 cm