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CHNB Unterwalden Obwalden Collection Gugelmann GSGUGEFEYERABENDC.tif Information Unterwalden Obwalden Unterwalden Umrissradierung gouachiert Aquarell Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEFEYERABENDC helveticarchives ch aspx ID helveticarchives ch Swiss National Library Prints