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CHNB Thunersee von Osten gegen Niesen und Stockhornkette Collection Gugelmann GSGUGEBLEULER.tif Information Thunersee von Osten gegen Niesen und Stockhornkette Vom Neuhaus seeabwrts Thunersee Gouachemalerei Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEBLEULER helveticarchives ch aspx