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3. Propiedades fı́sicas, hidrofı́sicas y fı́sico-mecánicas de los suelos Ferralı́ticos Rojos compactados en Cuba;Camacho;Cienc. Agric.,1984
4. Eijkelkamp, 1990. Equipment for Soil Research. Eijkelkamp Co., The Netherlands, 240 pp.
5. Food and Agriculture Organization (FAO), 1989. FAO-UNESCO soil map of the world. FAO Report 60, Rome.