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Perera N. P., "The Vegetation and Soils of the Northern Province of Sri Lanka and their Agricultural Potential", Proceedings of the Fourth International Conference Seminar of Tamil Studies - Volume Two : Fourth International Conference Seminar of Tamil Studies, Jaffna, Sri Lanka, 3 - 9 January 1974. Edited by Vithiananthan, S., International Association of Tamil Research, Sri Lanka, September 1980, 11-18.
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