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journalAt: Mededelingen Rijks Geologische Dienst, Series, Nieuwe, 53 By: van Amerom H. W. J.
journalAt: Carnets de Géologie / Notebooks on Geology, 21, 1 By: Granier B., Michaud F.
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journalAt: Comptes rendus hebdomadaires des séances de l’Académie des Sciences, Paris, 244, 24 By: Deflandre G., Durrieu L.