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

    Published 2001
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    Artículo preliminar
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    Adopting improved farm technology: a study of smallholder farmers in Eastern Province, Zambia by Celis, Rafael, Milimo, John T., Wanmali, Sudhir

    Published 1991
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    Artículo preliminar
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    Development in Costa Rica: The key role of agriculture by Celis, Rafael, Lizano, Eduardo

    Published 1995
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    Book Chapter
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    The distribution of benefits arising from price change and factor substitution in agriculture : a mathematical programming approach. by Celis, Rafael

    Published 1988
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    Artículo preliminar

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