From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_173_Approaches_... Uploaded by Kognos. Last modified 4 months ago. 8 control points.
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File:Admiralty Chart No 173 Approaches to Helsingfors and Sveaborg, Published 1895, Large Corrections 1926.jpg
From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_173_Approaches_... Uploaded by Kognos. Last modified 4 months ago. 8 control points. Links: Wikimedia Commons
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