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CHNB Mer de Glace depuis le Montenvers Collection Gugelmann GSGUGEHACKERTB.tif Information Mer de Glace depuis le Montenvers Mer de Glace Umrissradierung koloriert Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEHACKERTB helveticarchives ch aspx ID helveticarchives ch Swiss National Library