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IjenAnsichten Ansichten des IjenGebirges aus verschiedenen Himmelsrichtungen Kemmerling De Geologie en Geomorphologie van den Idjen Tafel VI Ausschnitt br original text Geoethno de br original text Koninklijke Natuurkundige Vereeniging BataviaWeltevreden PDold original upload log page de IjenAnsichten Geoethno bytes no