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Updated: May 5, 2025
The geology of this region has had many investigators, of whom the chief are Steininger, Erloschenen Vulkane in der Eifel ; Hibbert, Extinct Volcanoes of the Basin of Neuwied, 1832; Nöggerath, Das Gebirge im Rheinland, etc., 4 vols.; Horner, "On the Geology of Bonn," Transactions of the Geological Society, London, vol. iv. The views of Dr.
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