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Agroforestry and soil conservation: adoption and profitability in El Salvador
(CATIE, Turrialba (Costa Rica), 1997)
State of art on methodological packages for planning and implementation of natural resources conservation projects for rural development and modern watershed management concepts for developing countries
(CATIE, Turrialba (Costa Rica). Programa Manejo Integrado de Recursos Naturales. Area de Manejo de Cuencas, 1993)