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CHNB Mainau von Nordwesten Collection Gugelmann GSGUGEBLEULERb.tif Information Creator Johann Ludwig Bleuler Mainau von Nordwesten Mainau Aquatinta koloriert Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEBLEULERb helveticarchives ch aspx ID helveticarchives ch Swiss National Library