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Perspectives for agronomy : adopting ecological principles and managing resource use : proceedings of the 4th Congress of the European Society for Agronomy, Veldhoven and Wageningen, the Netherlands, 7-1 July 1996

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Perspectives for agronomy : adopting ecological principles and managing resource use : proceedings of the 4th Congress of the European Society for Agronomy, Veldhoven and Wageningen, the Netherlands, 7-1 July 1996

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