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Extensión del idioma / Francisco J. Ayala by Ayala, Francisco, , 1906-2009. Source: Cuadernos Hispanoamericanos vol. 121, nº. 361-362, 1980, págs. 131-151Material type: Article; Format:
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El fenómeno de la erosión / Pedro E. Coria by Coria, Pedro E. Source: Revista de Educacion vol. 4, nº. 1, 1959, págs. 27-33Material type: Article; Format:
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