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CHNB Bern Gesamtansicht von Sden Collection Gugelmann GSGUGEABERLIB.tif Information Bern Gesamtansicht von Sden Bern Radierung Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEABERLIB helveticarchives ch aspx ID helveticarchives ch Swiss National Library Prints and Drawings Department