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CHNB Chur und Umgebung von Nordosten Collection Gugelmann GSGUGEBLEULERb.tif Information Creator Johann Ludwig Bleuler Creator Friedrich Salath Chur und Umgebung von Nordosten Chur Aquatinta koloriert Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEBLEULERb helveticarchives ch aspx ID