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3. Oxygen isotope calibration of the onset of ice-rafting and history of glaciation in the North Atlantic region
4. Aspectos geomorfológicos, pedológicos, palinológicos y paleoecológicos en el área del Parque Natural Nacional de los Nevados (Tolima, Risaralda);Thouret;Rev CIAF,1981
5. Upper quaternary vegetational and climatic sequence of the fuquene area (Eastern Cordillera, Colombia)