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CHNB Koblenz mit Festung Ehrenbreitstein von Sden Rhein abwrts Collection Gugelmann GSGUGEBLEULERa.tif Information Creator Johann Ludwig Bleuler Koblenz mit Festung Ehrenbreitstein von Sden Rhein abwrts Koblenz Aquatinta Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEBLEULERa helveticarchives