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CHNB Sankt Petersinsel von Sdwesten gegen Biel Collection Gugelmann GSGUGEHARTMANNA.tif Information Sankt Petersinsel von Sdwesten gegen Biel Erste Ansicht der Petersinsel im Bielersee Sankt Petersinsel Umrissradierung Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEHARTMANNA helveticarchives