From: https://commons.wikimedia.org/wiki/File:Trigonometrical_Survey_Williams_Mu... Uploaded by Kognos. Last modified almost 2 years ago. 20 control points.
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File:Trigonometrical Survey Williams Mudge Dalby 1797 Tab XI Scillies transposed.jpg
From: https://commons.wikimedia.org/wiki/File:Trigonometrical_Survey_Williams_Mu... Uploaded by Kognos. Last modified almost 2 years ago. 20 control points. Links: Wikimedia Commons
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