From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_1491_Harwich_Ha... Uploaded by Brian Tiplady. Last modified over 3 years ago. 6 control points.
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File:Admiralty Chart No 1491 Harwich Harbour, Published 1959.jpg
From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_1491_Harwich_Ha... Uploaded by Brian Tiplady. Last modified over 3 years ago. 6 control points. Links: Wikimedia Commons
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