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CHNB Unterseen von Nordosten Collection Gugelmann GSGUGEABERLIC.tif Information Creator Johann Ludwig Aberli Unterseen von Nordosten Unterseen von Nordosten Mit Blick gegen den Niesen Unterseen Federzeichnung Aquarell Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEABERLIC helveticarchives