From: https://commons.wikimedia.org/wiki/File:Roy_1777_Plate_18_Triangulation_of... Uploaded by Kognos. Last modified over 2 years ago. 4 control points.
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File:Roy 1777 Plate 18 Triangulation of Snowdon and Moel Eilio philosophicaltra6717roya 0847.jpg
From: https://commons.wikimedia.org/wiki/File:Roy_1777_Plate_18_Triangulation_of... Uploaded by Kognos. Last modified over 2 years ago. 4 control points. Links: Wikimedia Commons
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