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CHNB Teufelsbrcke alte Collection Gugelmann GSGUGEKELLERHE.tif Information Creator Heinrich Keller Teufelsbrcke alte Die Teufelsbrcke in der Schllenenschlucht Teufelsbrcke Aquarell Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEKELLERHE helveticarchives ch aspx ID helveticarchives ch