From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_3347_Helgoland_... Uploaded by Kognos. Last modified almost 4 years ago. 4 control points.
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File:Admiralty Chart No 3347 Helgoland Bight and approaches, Published 1919.jpg
From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_3347_Helgoland_... Uploaded by Kognos. Last modified almost 4 years ago. 4 control points. Links: Wikimedia Commons
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