P C Aw & A C Ooi
1979 directory on the clay sand and rock based industries in peninsular Malaysia - IM 17/1997 Volume 1 - Ipoh Perak Jabatan Penyiasatan Kajibumi Malaysia 1997 - ill:63p. 29.8 cm
1979 directory on the clay sand and rock based industries in peninsular Malaysia - IM 17/1997 Volume 1 - Ipoh Perak Jabatan Penyiasatan Kajibumi Malaysia 1997 - ill:63p. 29.8 cm