Changing agricultural oportunities, the role of farming systems approaches : proceedings of the 14th International Symposium on Sustainable Farming Systems, Colombo, Sri Lanka, 11-16 November, 1996

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International Symposium on Sustainable Farming Systems (14th : 1996 : Colombo, Sri Lanka)

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International Symposium on Sustainable Farming Systems (14th : 1996 : Colombo, Sri Lanka)

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