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CHNB Grindelwald beide Gletscher mit Mettenberg Collection Gugelmann GSGUGEWEIBELE.tif Information Grindelwald beide Gletscher mit Mettenberg Grindelwald Umrissradierung koloriert Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEWEIBELE helveticarchives ch aspx ID helveticarchives ch Swiss