From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_126_Helgoland,_... Uploaded by Kognos. Last modified almost 2 years ago. 6 control points.
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File:Admiralty Chart No 126 Helgoland, Published 1914.jpg
From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_126_Helgoland,_... Uploaded by Kognos. Last modified almost 2 years ago. 6 control points. Links: Wikimedia Commons
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