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CHNB Hinterrhein und Averser Rhein Zusammenfluss Collection Gugelmann GSGUGEBLEULERb.tif Information Creator Johann Ludwig Bleuler Creator Friedrich Salath Hinterrhein und Averser Rhein Zusammenfluss in der Rofflaschlucht Hinterrhein Averser Rhein Aquatinta koloriert Swiss National Library CHNBCollection Gugelmann PDold User