Ong Wee Seck
Ageological investigation on the limestone hills of G Keroh G Merawan G Karang Besar and G karang Kecil Simpang Pulai area Kinta district Perak (RAK F2) - MX(N) 7 1977 - Ipoh Perak Jabatan Penyiasatan Kajibumi Malaysia 1977 - ill:47p. 29. 8 cm
Ageological investigation on the limestone hills of G Keroh G Merawan G Karang Besar and G karang Kecil Simpang Pulai area Kinta district Perak (RAK F2) - MX(N) 7 1977 - Ipoh Perak Jabatan Penyiasatan Kajibumi Malaysia 1977 - ill:47p. 29. 8 cm