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4. Die Eruptivgesteine des Kristianiagebietes—IV. Das Fengebiet in Telemark Norwegen (Eruptive rocks of the Oslo region—IV. The Fen Area in Telemark, Norway);Bbøgger;Vidensk. Skr., Mat.-Naturv. Kl.,1921
5. Die Eruptivgesteine des Kristianiagebietes—IV. Das Fengebiet in Telemark Norwegen (Eruptive rocks of the Oslo region—IV. The Fen Area in Telemark, Norway);Bbøgger;Vidensk. Skr., Mat.-Naturv. Kl.,1921