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CHNB Zrich aus der Vogelschau von Westen Collection Gugelmann GSGUGEHALDERC.tif Information Zrich aus der Vogelschau von Westen Zrich Umrissradierung koloriert Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGEHALDERC helveticarchives ch aspx ID helveticarchives ch Swiss National Library