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Annex: Oil and gas map. - Carte pétrolière. Prep. by the Amt für Bodenforschung, Hannover, under the direction of Prof. Dr. A. Bentz. Situation end 1956. Scale 1 : 2 500 000. OEEC, Paris 1957. 192 X 105 cm, farbig. = Sign. K 593
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