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CHNB Viamala Strecke ThusisRongellen Verloren Loch von Thusis her Collection Gugelmann GSGUGEBLEULERb.tif Information Creator Johann Ludwig Bleuler Creator Friedrich Salath Viamala Strecke ThusisRongellen Verloren Loch von Thusis her Viamala Aquatinta koloriert Swiss National Library CHNBCollection Gugelmann PDold User Swiss