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CHNB Biel und Bielersee von Nordosten Collection Gugelmann GSGUGEWETZELE.tif Information Biel und Bielersee von Nordosten Bienne Biel Sepia Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEWETZELE helveticarchives ch aspx ID helveticarchives ch Swiss National Library Prints and Drawings