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Días Vial, Carlos ,  Wright, Charles ,  [Soils of the arid zone of Northern Chile] ,  Soils of the arid zone of Northern Chile

Wright, Charles ,  Mella L., Arnoldo ,  [Modifications to the soil pattern of south-central Chile resulting from seismic and associated phenomenona during the period may to august 1960] ,  Modifications to the soil pattern of south-central Chile resulting from seismic and associated phenomenona during the period may to august 1960