From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_5375_North_Atla... Uploaded by Kognos. Last modified almost 2 years ago. 8 control points.
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File:Admiralty Chart No 5375 North Atlantic Ocean Magnetic Variation 1970 and Annual Rates of Change, Published 1970.jpg
From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_5375_North_Atla... Uploaded by Kognos. Last modified almost 2 years ago. 8 control points. Links: Wikimedia Commons
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