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Monitoring systems for managing natural resources: economics, indicators and environmental externalities in a Costa Rican watershed por Hazell, Peter B. R., Chakravorty, Ujjayant, Dixon, John, Celis, Rafael

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Adopting improved farm technology: a study of smallholder farmers in Eastern Province, Zambia por Celis, Rafael, Milimo, John T., Wanmali, Sudhir

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Development in Costa Rica: The key role of agriculture por Celis, Rafael, Lizano, Eduardo

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The distribution of benefits arising from price change and factor substitution in agriculture : a mathematical programming approach. por Celis, Rafael

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