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CHNB Thunersee Mondaufgang Collection Gugelmann GSGUGEKNIGC.tif Information Thunersee Mondaufgang Mondaufgang am Thunersee im Vordergrund zwei grosse Bume Thunersee Gouachemalerei Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEKNIGC helveticarchives ch aspx ID helveticarchives ch Swiss