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1Shade effect on coffee production at the northern tzeltal zone of the state of Chiapas, Mexico Shade effect on coffee production at the northern tzeltal zone of the state of Chiapas, Mexicoby Soto Pinto, Lorena 1958- Doctora 5454, Perfecto, Ivette Doctora autor/a 22535, Castillo Hernández, Juan autor/a, Caballero Nieto, Javier autor/aTexto bibliotecaECOSUR