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Kemna, Hans Axel (2005). Pliocene and Lower Pleistocene Stratigraphy in the Lower Rhine Embayment, Germany. Thesis Abstract, Universität zu Köln.
Kemna, Hans Axel (2005). Pliocene and Lower Pleistocene Stratigraphy in the Lower Rhine Embayment, Germany. Thesis Abstract, Universität zu Köln.