From: https://commons.wikimedia.org/wiki/File:Roy_1777_Triangulation_of_Snowdon_... Uploaded by Kognos. Last modified almost 2 years ago. 4 control points.
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File:Roy 1777 Triangulation of Snowdon and Moel Eilio 00907249 0159-0164.jpg
From: https://commons.wikimedia.org/wiki/File:Roy_1777_Triangulation_of_Snowdon_... Uploaded by Kognos. Last modified almost 2 years ago. 4 control points. Links: Wikimedia Commons
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