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CHNB Engstligenflle und Strubelgletscher im Wildstrubelmassiv Collection Gugelmann GSGUGEZEHENDERA.tif author attributed to Engstligenflle und Strubelgletscher im Wildstrubelmassiv File CHNB Engstligenflle und Strubelgletscher im Wildstrubelmassiv Collection Gugelmann GSGUGEZEHENDERA tif etching Swiss National Library CHNBCollection