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

    Changing Agricultural Opportunities : the role of farming systems approaches : proceedings of the 14th International Symposium on Sustainable Farming Systems, Colombo, Sri Lanka, 1...

    Published 1998
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