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CHNB Ksnacht Grebelhuser Collection Gugelmann GSGUGEFSSLIJMF.tif Information Creator Johann Melchior Fssli Ksnacht Grebelhuser Die Grebelhuser und der Wangensbach mit Turm und Staffelgiebel Ksnacht Kupferstich Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEF SSLIJMF helveticarchives