From: https://commons.wikimedia.org/wiki/File:Londonderry_Geological_Map_Portloc... Uploaded by Kognos. Last modified almost 2 years ago. 11 control points.
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File:Londonderry Geological Map Portlock 1843.jpg
From: https://commons.wikimedia.org/wiki/File:Londonderry_Geological_Map_Portloc... Uploaded by Kognos. Last modified almost 2 years ago. 11 control points. Links: Wikimedia Commons
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