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CHNB Riva am Lago di Mezzola nrdlichster Teil des Comersees Collection Gugelmann GSGUGEWETZELE.tif Information Riva am Lago di Mezzola nrdlichster Teil des Comersees Ripa Riva Aquatinta Sepia Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEWETZELE helveticarchives ch aspx ID helveticarchives