From: https://commons.wikimedia.org/wiki/File:Plan_af_Helsingfors_%C3%A5r_1859.j... Uploaded by Susanna Ånäs. Last modified about 8 years ago. 4 control points.
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File:Plan af Helsingfors år 1859.jpeg
From: https://commons.wikimedia.org/wiki/File:Plan_af_Helsingfors_%C3%A5r_1859.j... Uploaded by Susanna Ånäs. Last modified about 8 years ago. 4 control points. Links: Wikimedia Commons
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