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CHNB Sarnersee von Norden Collection Gugelmann GSGUGETROLLA.tif Information Sarnersee von Norden Blick vom Ausfluss der Sarneraa Richtung Sden gegen Sachseln Sarnersee Radierung Aquatinta Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGETROLLA helveticarchives ch aspx ID helveticarchives