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CHNB Thun Umgebung Schadau von Nordosten Collection Gugelmann GSGUGEWETZELE.tif Information Thun Umgebung Schadau von Nordosten Schadau Thun Sepia File CHNB Thun Schadau Collection Gugelmann GSGUGEWETZELC tif Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEWETZELE helveticarchives