The geology of South Perak, North Selangor, and the Dindings with a geological sketch-map - Scrivenor, J. B.; Jones, W. R.; Federated Malay States. Geological Survey Department (Kuala Lumpur : Federated Malay State Government Press, 1919)
Sketch-map is contained in the pocket attached to the back cover
Keywords: Geology -- Perak