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CHNB Bern Mittelland Collection Gugelmann GSGUGEBIRMANNUNDHUBERC.tif author Bern Mittelland Bern Umrissradierung koloriert Aquatinta Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEBIRMANNUNDHUBERC helveticarchives ch aspx ID helveticarchives ch Swiss National Library Prints and Drawings