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CHNB Koblenz Collection Gugelmann GSGUGEBLEULERc.tif Information Creator Johann Ludwig Bleuler Creator Sigismond Himely Koblenz Koblenz Aquatinta koloriert Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEBLEULERc helveticarchives ch aspx ID helveticarchives ch Swiss National Library Prints