From: https://commons.wikimedia.org/wiki/File:Principal_British_Hydrographic_Sur... Uploaded by Brian Tiplady. Last modified almost 3 years ago. 10 control points.
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File:Principal British Hydrographic Surveys to 1829.jpg
From: https://commons.wikimedia.org/wiki/File:Principal_British_Hydrographic_Sur... Uploaded by Brian Tiplady. Last modified almost 3 years ago. 10 control points. Links: Wikimedia Commons
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