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CHNB Grindelwald unterer Gletscher mit Eiger Collection Gugelmann GSGUGEBIEDERMANNA.tif Information Creator Johann Jakob Biedermann Grindelwald unterer Gletscher mit Eiger Grindelwald Umrissradierung koloriert Aquatinta Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEBIEDERMANNA Swiss National