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1Natural regeneration of tree species in pastures on peasant land in Chiapas, Mexico Natural regeneration of tree species in pastures on peasant land in Chiapas, Mexicoby Pignataro, Ana Genoveva, Levy Tacher, Samuel Israel, Aguirre Rivera, Juan Rogelio, Nahed Tora, José, González Espinosa, Mario, González Arzac, Adelia, Biganzoli, FernandoTexto bibliotecaUBA FA