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3. Baak, J. A., 1936. Regional Petrology of the Southern North Sea. Thesis, State University, Leiden, Veenman, Wageningen, 128 pp.
4. Relevés hydrographiques exectés au cours de quatre premières croisieres: résultats de croisières scientifiques du navire “President Theodore Tissier”;Beaugé;Rev. Trav. Off. Pěches Marit.,1937
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