Art 10 - ubiobio.cl · 2010. 9. 27. · GEMA QUIROZ* JORGE BARROS Universidad del Bío-Bío...
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Art 10 - ubiobio.cl · 2010. 9. 27. · GEMA QUIROZ* JORGE BARROS Universidad del Bío-Bío RESUMEN: ... of the soil in the face of a weak environment which requires to be maintainable