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CHNB Bauern Flachsbrechen Collection Gugelmann GSGUGEKNIGE.tif Information Bauern Flachsbrechen La famille laborieuse Sepia Bleistiftzeichnung CHNB Bauern Flachsbrechen Collection Gugelmann GSGUGEKNIGC tif Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEKNIGE helveticarchives ch aspx