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CHNB Zihlbrcke und Chteau de Thielle Collection Gugelmann GSGUGEABERLI.tif Information Creator Johann Ludwig Aberli Zihlbrcke und Chteau de Thielle Zihlbrcke Umrissradierung koloriert File CHNB Naturstudie Collection Gugelmann GSGUGEABERLIF tif Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library