"Selangor." . . "Perak." . . . . "The geology of south Perak, North Selangor, and the Dindings with a geological sketch-map" . . . . . . . . . . . . . "The geology of South Perak, North Selangor, and the Dindings, with a geological sketch-map"@en . . . . . . "Federated Malay States. Geological Department." . . "Malaysia." . . "Geology." . .