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CHNB Rosenlauigletscher Collection Gugelmann GSGUGEWOLF.tif Information Creator Friedrich Rosenberg Creator CharlesMelchior Descourtis Creator Rudolf Samuel Henzi Rosenlauigletscher Rosenlauigletscher Farbkupferstich Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEWOLF helveticarchives