From: https://commons.wikimedia.org/wiki/File:Senaatinkartta_Helsingist%C3%A4_18... Uploaded by Orienteerix. Last modified over 6 years ago. 4 control points.
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File:Senaatinkartta Helsingistä 1870-luvulla.jpg
From: https://commons.wikimedia.org/wiki/File:Senaatinkartta_Helsingist%C3%A4_18... Uploaded by Orienteerix. Last modified over 6 years ago. 4 control points. Links: Wikimedia Commons
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