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Excerpt from Die Phonolithischen Gesteine des Laachersee-Gebiets und der Hohen Eifel: Inaugural-Dissertation zur Erlangung der Philosophischen Doctorwürde, Welche mit Genehmigung der Hohen Philosophischen Facultät der Vereinigten Friedrichs-Universität Halle-Wittenberg am Mittwoch den 23. Juli 1890
Norm: Orographische Briefe uber das Siebengebirge und die benachbarten 2. Th. Vulkanischen Gegenden an beiden Ufern des Niederrheins. Bd. 1. Frankfurt a. M. 1789. Bd. 2, ebenda, 1791.
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