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CHNB Zollikon Traubenberg Collection Gugelmann GSGUGEFSSLIJMF.tif Information Creator Johann Melchior Fssli Zollikon Traubenberg Zollikon Kupferstich Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEF SSLIJMF helveticarchives ch aspx ID helveticarchives ch Swiss National Library Prints