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Impact of farming systems diversification on erosion and highland agroecosystem sustainability in Northern Thailand. Trébuil Guy, Turkelboom Francis, Thong-Ngam Charal, Pheng Kam Suan. 1996. In : 14th International Symposium on Sustainable Farming Systems. 11-16 November, 1996, Colombo, Sri Lanka. Symposium proceedings. Contributed papers. Sri Lanka-Ministry of Agriculture Lands Forestry, AFSA, AFSAE. Colombo : Ministry of Agriculture Lands Forestry, TW2/53-TW2/62. International Symposium on Sustainable Farming Systems. 14, Colombo, Sri Lanka, 11 Novembre 1996/16 Novembre 1996.