Reconnaisance soil survey of Penang and Province Wellesly - Soo, Swee Weng; Selvadurai, K.; Malaysia. Jabatan Pertanian. Bahagian Sains Tanah. Cawangan Penyelidikan (a Kuala Lumpur : Soil Science Division, Division of Agriculture, Ministry of Agriculture and Fisheries, 1969)
Keywords: Soil surveys -- Pulau Pinang; Soil -- Pulau Pinang