From: https://commons.wikimedia.org/wiki/File:Karta_%C3%B6fver_Helsingfors_1866.... Uploaded by Susanna Ånäs. Last modified over 6 years ago. 3 control points.
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File:Karta öfver Helsingfors 1866.jpeg
From: https://commons.wikimedia.org/wiki/File:Karta_%C3%B6fver_Helsingfors_1866.... Uploaded by Susanna Ånäs. Last modified over 6 years ago. 3 control points. Links: Wikimedia Commons
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