From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_2660a_China_Sea... Uploaded by Kognos. Last modified almost 3 years ago. 6 control points.
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File:Admiralty Chart No 2660a China Sea, Southern Portion, Western Sheet, Published 1881, Corrections to 1887.jpg
From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_2660a_China_Sea... Uploaded by Kognos. Last modified almost 3 years ago. 6 control points. Links: Wikimedia Commons
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