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CHNB Brienzersee bei Iseltwald von Nordosten Collection Gugelmann GSGUGERIETERHA.tif Information Brienzersee bei Iseltwald von Nordosten Brienzersee Umrissradierung koloriert Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGERIETERHA helveticarchives ch aspx ID helveticarchives ch Swiss