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CHNB Oberhofen Schloss und Thunersee von Nordwesten Collection Gugelmann GSGUGEBIRMANNUNDFILSC.tif author Oberhofen Schloss und Thunersee von Nordwesten Oberhofen Aquatinta koloriert Gouachemalerei Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEBIRMANNUNDFILSC helveticarchives ch aspx