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CHNB Wetterhorn von Nordosten Collection Gugelmann GSGUGEBIRMANNUNDHUBERC.tif author Wetterhorn von Nordosten Wetterhorn Umrissradierung Aquatinta Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEBIRMANNUNDHUBERC helveticarchives ch aspx ID helveticarchives ch Swiss National Library Prints