Results of a drug prevention program in the changing attitudes of students by Cristóbal VILLANUEVA ROA

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Enteric Methane Emissions in Dairy Cows with Different Genetic Groups in the Humid Tropics of Costa Rica by Cristóbal Villanueva, Muhammad Ibrahim, Cristina Castillo

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Uso de la diversidad forrajera tropical en combinaciones pareadas de leñosas forrajeras como indicador de preferencia para su inclusión en el diseño de sistemas silvopastoriles en... by Nelson P�rez, Muhammad Ibrahim, Cristóbal Villanueva, Christina Skarpe, Hubert Guerin

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Botanical diversity, structure and composition in cocoa agroforest systems in Alta Verapaz, Guatemala by Carlos Enrique Villanueva-González, José Alejandro Ruiz-Chután, Marie Kalousova, Roberto Waldemar Moya Fernandez, Cristobal Villanueva, Bohdan Lojka

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