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CHNB Unterwalden Nidwalden Collection Gugelmann GSGUGEFEYERABENDC.tif Information Creator Franz Feyerabend Unterwalden Nidwalden Unterwalden Umrissradierung gouachiert Aquarell Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEFEYERABENDC helveticarchives ch aspx ID helveticarchives ch