Makmal Penyiasatan Kajibumi Subsidence and Sinkhole Occurrence in Bukit Merah New Village, Menglembu, Ipoh : RAK (L1) no. E(F)5/1982 Makmal Penyiasatan Kajibumi - 1982 - 1 v.(various pagings) 30 cm.+ 2 maps ISSN: Subjects--Topical Terms: Geology investigation--Ipoh--Perak