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LiblarUmbergrube. Kupferstich Torf oder Umbererengrube bey Liblar vier Meilen von Klln Engraving Peat or umber pit at Liblar four miles from Cologne Scanvorlage Arno Kleinbeckel Unternehmen Braunkohle Kln ca Anonymous PDold Openpit lignite mines in the Rhenish area Liblar
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