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CHNB Bern Bau des Muristalden Collection Gugelmann GSGUGEDUNKERBAE.tif Information Creator Balthasar Anton Dunker Bern Bau des Muristalden Bern Radierung koloriert Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEDUNKERBAE helveticarchives ch aspx ID helveticarchives ch Swiss National